Games like Alien Swarm
by Valve
Co-operative multiplayer game and complete code base available for free.
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Ranked by how similar the games actually are, not by sales. Released and Price are remembered for next time.
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-50%$7.49KILL IT WITH FIRE! 2
Nov 25 · Casey Donnellan Games LLC
Both: Online Co-Op · Sci-fi · Co-op
KILL IT WITH FIRE! 2 is the ultimate co-op spider-hunting experience! Either solo or as a team of Exterminators, unleash an arsenal of crazy weapons, wreak havoc, and complete dozens of challenges across seven dimensions under spider siege.
Online Co-OpSci-fiCo-opMultiplayerComedy3DPhysicsCasualFunnyHorror👍 1,434
$29.99Voidtrain
Nov 7 · HypeTrain Digital
Both: Co-op · Online Co-Op
Become a crew member of an Interdimensional Express Train! Discover a new world full of mysterious creatures, enemies and places. Upgrade and customize your train, gather new materials and build better weapons. Play solo or online сo-op with up to 4 people.
Open World Survival CraftCo-opTrainsMultiplayerSurvivalBase BuildingOpen WorldCraftingOnline Co-OpAdventure👍 8,715
$12.99The Spell Brigade
Apr 29 · Bolt Blaster Games
Both: Online Co-Op · Co-op
Survivors-like with ONLINE CO-OP for 1-4 players. Team up with your wizard friends to slay hordes of dark creatures. Complete team-based objectives, unlock new upgrades and create overpowered spell synergies. Friend nor foe is safe in this friendly fire bullet hell!
Bullet HeavenOnline Co-OpRogueliteBullet HellCo-opAction RoguelikeRoguelikeMagicMultiplayerAction👍 14,750
$12.99Temtem: Swarm
Apr 2 · Crema, GGTech Studios
Both: Online Co-Op
Can you Survive the Swarm? Unlock mighty abilities and upgrades, find and collect Tems to evolve and become stronger, discover overpowered strategies, and battle massive bosses in this survivor-like bullet heaven! Play solo or online co-op with up to 3 players, building the wildest synergies.
Bullet HeavenCreature CollectorAction RoguelikeOnline Co-OpRogueliteTwin Stick ShooterBullet HellRoguelikeArcadeIsometric👍 2,490
$29.99No More Room in Hell 2
Aug 11 · Torn Banner Studios
Both: Online Co-Op · Co-op
No More Room in Hell 2 is an intense 8 player zombie shooter. Overcome the endless undead. Avoid infection. Survive hell together.
ZombiesMultiplayerOnline Co-OpCo-opSurvival HorrorActionSurvivalFPSFirst-PersonIndie👍 16,843
$8.99Sketchy's Contract
Jul 15 · Dimensionless Games
Both: Online Co-Op · Co-op · Sci-fi
A 1-8 player co-op sci-fi looter horror game that takes place on a mysterious asteroid belt where players must complete contracts by traveling to exotic planets to kill creatures, find loot, and/or farm planetary materials that they must return to an ominous figure named Sketchy.
Online Co-OpHorrorFirst-PersonCo-opExplorationSci-fiSurvival HorrorAtmosphericAdventurePsychological Horror👍 1,027
$10.99Sineus Arena Survivors
Jun 22 · Sineus Games
Both: Online Co-Op · Co-op
Fight hordes and defend your Stronghold in a bullet heaven survivor-like with co-op and tower defense. Gain power-ups every level, collect random artifacts from chests and grow stronger to survive, defeat the boss and claim a top spot on the Sineus Arena leaderboards!
Bullet HeavenAction RoguelikeRoguelikeOnline Co-OpCo-opBullet HellLootTower DefenseScore AttackIndie👍 1,163
$7.99Arcadium - Space Odyssey
Jan 26 · Luciano Bercini
Both: Top-Down Shooter · Aliens
A bullet heaven roguelite set in a procedurally generated universe. Land on planets to harvest resources, craft hundreds of game-breaking builds, and unleash them on relentless waves of aliens. Every run unveils a new universe: endless challenges, endless discoveries.
Bullet HeavenRogueliteArcadeAction RoguelikeBullet HellProcedural GenerationTwin Stick ShooterTop-Down ShooterSpaceAliens👍 110
$29.99Active Matter
6 days ago · Matter Team
Both: Co-op · Online Co-Op
Join dangerous raids for loot or intense PvP battles in this new realistic military shooter set in a fractured multiverse. Fight in the quantum unstable zones over control of the active matter – the substance that bends time and space.
FPSHorrorExtraction ShooterPvEPvPAtmosphericCo-opOnline Co-OpMultiplayerAction👍 802
-20%$7.99Escape the Backrooms
Oct 23 · Fancy Games, Blackbird Interactive
Both: Online Co-Op · Co-op
Escape the Backrooms is a 1-4 player co-op horror exploration game. Traverse 30+ eerie backrooms levels while avoiding entities and other dangers. Try to escape but be warned: survival isn't guaranteed.
HorrorMultiplayerOnline Co-OpPsychological HorrorCo-opSurvival HorrorFirst-PersonEscape RoomExplorationAdventure👍 137,469
$19.99Eden Crafters
May 7 · Osaris Games
Both: Online Co-Op
Eden Crafters is a solo or co-op open-world survival, crafting, and factory-building game where you transform a hostile planet into a habitable haven for humanity. Build, automate, and terraform. Control the climate, create a breathable atmosphere, and turn toxic lakes into water: shape a new world!
AutomationOpen World Survival CraftBase BuildingCraftingSandboxOpen WorldOnline Co-OpBuildingSurvivalAdventure👍 2,515
$9.99Pathogenic
Jul 16 · Aberrant Labs
Both: Top-Down Shooter · Shooter
You are a disease. Infect the human body as a lone pathogen in this cellular roguelike shooter. Collect organelles to evolve your parasite in a microscopic arms race against your host's immune system. Conquer a beautiful, procedurally generated world of tiny proportions.
RoguelikeBullet HellTop-Down ShooterLocal Co-OpBullet HeavenAction RoguelikeDifficultDungeon CrawlerShooterCharacter Customization👍 4,186
$14.99MycoRelic
Sep 24 · Sandy Dingo Games
Both: Online Co-Op · Co-op
MycoRelic is a cooperative third person action-RPG set on islands inhabited by tribal mushroom robots. Loot derelict foundries to upgrade your robotic body. Explore ancient temples to infuse your fungus with forgotten elemental powers.
Early AccessSouls-likeAction RPGOnline Co-OpExplorationMultiplayerRPGThird Person3DCo-op👍 166
$29.99Palworld
Jul 9 · Pocketpair
Both: Online Co-Op · Co-op
Fight, farm, build and work alongside mysterious creatures called "Pals" in this completely new multiplayer, open world survival and crafting game!
Open WorldSurvivalCreature CollectorMultiplayerOpen World Survival CraftOnline Co-OpCraftingIndieCo-opAdventure👍 412,343
$39.99Into the Radius 2
Apr 23 · CM IMMERSIVE
Both: Co-op · Shooter
Into the Radius 2 is an immersive VR survival shooter, set in a realm of surreal landscapes and deadly entities known as Pechorsk Anomaly. Arm yourself with realistic weapons and venture deeper into the mysteries within. Featuring co‑op for up to four players.
VRFPSSurvivalCo-opImmersiveRealisticGun CustomizationShooterPost-apocalypticAction👍 5,261
$9.99Darkwater
Mar 26 · Targon Studios
Both: Online Co-Op · Co-op
Darkwater is a cooperative extraction horror game for 1-4 players. Command a submarine trapped under the ice of an alien planet. Battle enemy vessels and deep sea abominations as you hunt for resources. Do what it takes to survive.
Online Co-OpHorrorSurvivalSubmarineMultiplayerStrategyNavalUnderwaterCo-opPvE👍 989
$29.99Valheim
12 days ago · Iron Gate AB
Both: Online Co-Op · Co-op
A collaborative exploration and survival game for 1-10 players, set in a procedurally generated afterlife inspired by Viking culture. Battle, build, and conquer your way to a saga worthy of Odin’s patronage!
Open World Survival CraftSurvivalOnline Co-OpOpen WorldMultiplayerBuildingCraftingBase BuildingExplorationCo-op👍 465,813
$19.99The Front
Oct 30 · Samar Studio
Both: Shooter
The Front is a survival open-world crafting sandbox game. You are a resistance fighter sent back in time to stop the rise of a tyrannical empire. Collect resources, craft tech, build shelters, and fight monsters to accomplish your mission.
Open World Survival CraftMultiplayerSurvivalCraftingBase BuildingBuildingOpen WorldTower DefenseSandboxShooter👍 9,553
$7.99Backrooms Media
Dec 16 · NPK Games
Both: Co-op · Online Co-Op
Backrooms Media is a 1-4 player co-op horror that plunges you into unsettling, hyper-realistic liminal spaces. Navigate eerie environments filled with lurking horrors. Group up with your friends to face the terror of the endless backrooms together and... try to escape.
Co-opMultiplayerCasualPsychological HorrorHorrorOnline Co-OpSurvival HorrorFirst-PersonExplorationSingleplayer👍 546
-50%$19.99Terra Invicta
Jan 5 · Pavonis Interactive
An alien invasion has fractured humanity into seven ideological factions each with a unique vision for the future. Lead your chosen faction to take control of Earth’s nations, expand across the Solar System, and battle enemy fleets in tactical combat.
StrategyGrand StrategySimulation4XEconomyWarHistoricalTurn-Based StrategyTacticalManagement👍 9,064
$14.99Yet Another Zombie Survivors
Aug 20 · Awesome Games Studio
Both: Top-Down Shooter
The Horde is coming, but you're ready to fight it! Assemble your squad, choose their upgrades, and build powerful synergies against thousands of undead. Survive. Then evolve. Then break every limit in this deceptively simple but addictive bullet heaven game.
Bullet HeavenAction RoguelikeZombiesTop-Down ShooterRogueliteIndieArcadeSingleplayerAction RPGRoguelike👍 14,162
$4.99Survivors 27
Feb 4 · Studio 27
Both: Shooter · Top-Down Shooter · Top-Down
Scavenge-Fight-Extract, PvE/PvPvE/PvP, Enter the danger zone, explore the map, scavenge for supplies and gear, battle enemies, and successfully extract. Every mission is fraught with the unknown—will you escape safely with your loot, or lose everything?
ActionLootLooter ShooterHeistShooterTop-Down ShooterTop-DownMilitaryScore AttackCasual
$17.99Angels Fall First
Jul 11 · Strangely Interactive Ltd
Both: Sci-fi
From commanding the battle standing on the bridge of your flagship all the way down to tactical infantry firefights - AFF brings together all the combat you ever loved in a rich science fiction setting. Boarding, pilotable capital ships, deep weapon customization and full Bot support included!
ActionFPSIndieMultiplayerSci-fiSpaceSimulationFirst-PersonSingleplayerTactical👍 3,834
-20%$7.19Save Mom
3 days ago · Amigos Entertainment
Both: Co-op · Top-Down Shooter · Shooter
A co-op action game about protecting your mom in a post-apocalyptic world. Explore ruined cities, gather resources, upgrade your motorhome, build defenses, and battle enemies. Your mission: Get Mom to safety. Her survival is in your hands!
ActionCo-opCartoonyTop-Down ShooterPvEFunnyShooter3DPost-apocalypticBase Building
$39.99Xenonauts 2
Apr 2 · Goldhawk Interactive
Both: Sci-fi
Wage a global war of resistance against an alien invasion. Command turn-based tactical battles, build a network of covert bases, directly control your fighter wings, and achieve strategic victory in a simulation of asymmetric warfare against a technologically superior foe.
StrategyRPGTurn-Based TacticsTurn-Based StrategySci-fiTurn-Based CombatTacticalTurn-BasedPvECharacter Customization👍 4,857
$19.99Project L33T: Founders Edition
Jun 23 · Targetpoint Interactive, Holmgard Games
Both: Shooter
Join the persistent open world of OZERSK! Choose your way to play on PvE or PvP servers, fight for precious loot and gear, and risk it all in a hostile environment. Die, lose all your gear and loot, then return to the same server in hopes of retrieving what you lost. This is your story!
ActionRPGLooter ShooterFPSShooterSandboxOutbreak Sim3DFirst-PersonRealistic👍 525
-30%$17.49Stellar Tactics
Mar 30 · Don Wilkins
A Sci-Fi role-playing game featuring turn-based ground combat, space exploration, deep character customization and a massive living universe with thousands of star systems. Equip your ships with the best equipment you can find, gather a powerful crew of mercenaries and set out into the void!
CRPGExplorationTactical RPGTurn-Based TacticsDungeon CrawlerSandboxParty-Based RPGCharacter CustomizationRPGIsometric👍 1,667
$28.99Scrap Mechanic
Jul 24 · Axolot Games
Both: Co-op
Enter the creative paradise of Scrap Mechanic! Build fantastic machines, go on adventures with your friends and defend against waves of evil Farmbots in this imaginative multiplayer survival sandbox. With Scrap Mechanic’s powerful creation tools you can engineer your own adventures!
BuildingSandboxMultiplayerSurvivalOpen WorldPhysicsCraftingBase BuildingCo-opAdventure👍 109,480
$19.99Astro Colony
Jun 2 · Terad Games
Explore endless Universe and create the most efficient constellation of colonies. Build conveyor systems to automate production. Take care of Astronauts and their needs! Establish new colonies as part of intergalactic simulation.
Base BuildingAutomationSpaceResource ManagementColony SimSimulationMultiplayerStrategyBuildingIndie👍 2,397
Also worth a look
Share some of the same DNA, but further from the original.
-25%$14.99Raiders of Blackveil
Dec 15 · Wombo Games
Both: Top-Down · Online Co-Op
Join the rebellion against the evil corporation Blackveil in this action-packed roguelite for 1-3 players. Select your MOBA-like champion, collect RPG-style loot and infiltrate Blackveil’s massive factory. Wreak havoc, and smuggle out loot to get INSANELY powerful!
Action RoguelikeMultiplayerRogueliteLootTop-DownOnline Co-OpDungeon CrawlerReplay ValueIndieEarly Access👍 1,361
$29.99Occupy Mars: The Game
Jan 30 · ▲ Pyramid Games
Both: Online Co-Op
Survive and colonize Mars alone or in online co-op. Build and upgrade your base, craft equipment, mine resources, produce water, oxygen and food, explore an open world, and repair complex machinery in a technical survival sandbox.
Open World Survival CraftBase BuildingSurvivalCraftingOnline Co-OpOpen WorldResource ManagementExplorationSandboxPvE👍 2,717
$34.99Pioneers of Pagonia
Dec 11 · Envision Entertainment
Both: Online Co-Op
Rebuild hope in a world that was lost in the fog. Lead your Pioneers across the isles of Pagonia, unite scattered tribes, raise thriving communities and discover the history of your people as you reclaim your world in the new story campaign.
StrategyResource ManagementColony SimOnline Co-OpFantasyBase BuildingCity BuilderManagementProcedural GenerationPvE👍 4,794
$17.99Sephiria
Jul 31 · TEAM HORAY
Both: Co-op
Save Bunnyville from a doomed fate: a top-down action/RPG roguelite from the makers of Dungreed. Explore the depths of the tower, collect and upgrade artifacts, and defeat hordes of demons to keep your village safe.
Action RoguelikeRogueliteRoguelikeCo-opPixel GraphicsInventory ManagementActionRPGCombatCute👍 11,674
-15%$12.74Biovoid
3 days ago · Dzedou
Both: Aliens
Biovoid is a creature-building roguelike game where you slay hordes of hostile aliens. Combine a variety of cells and mutations to create game-breaking builds and evolve from a fragile hatchling to a deadly predator.
Action RoguelikeSimulationSandboxNatureSurvivalProcedural GenerationBuildingPerma DeathDifficultAliens

