Games like Half-Life: Source

『UNBOUND PROVIDENCE』はレトロな3Dダンジョン探索アクションRPG。鉱山から繋がった未知の迷宮を探索しよう！

Run your dream ice cream shop in Ice Cream Simulator! Create delicious ice cream using a variety of ingredients, manage your business, hire staff, decorate your store, handle changing weather and different customers, and enjoy a relaxing first-person simulation experience.

An old-school shooter inspired by Wolfenstein 3D. You are one of the prisoners of an ancient prison. There is no one to help you. You only have yourself to rely on. Your shotgun. Against hordes of enemies. Animal rage and the desire to kill. Destroy Them All!

A fast paced silly cutegore FPS! Earth has been taken over by demons. A catgirl codenamed MeowMeow fights back! MEOW, GUN, CLAW and BLOW UP hordes of evil demons, zombies, and other monsters in colorful environments with tons of weapons! The game runs on the FTEQW engine.

Use a rearview mirror to fight through a horror-filled hellscape in this Doom-inspired retro-fps. Shoot behind you, detect invisible enemies & never fall victim to enemy traps.Find new weapons, unlock abilities & warp to maps at any time!Objects In Mirror Are Closer Than They Appear!

After a deadly virus left humanity paralyzed, survivors now battle on wheels! Customize your rig, sharpen your aim, and roll into fast-paced wheelchair warfare across multiple maps and modes. Join the fight!

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.

ASCEND and claim your rightful place as the Hand of the Empress. Become AB3, an immortal super soldier, in this action packed first-person shooter that combines old school style with new era gunplay.

Kebab Chefs! is a Co-Op, cooking and restaurant management game that can be played up to 4 players. Design your own restaurant. Cook delicious foods, fill your menu with various recipes, feed customers and become the biggest kebab restaurant in town!

You have only 5 minutes to stylishly explode your way through the hordes of corrupted entities in a retro FPS, roguelike liminal-nightmare... and Timmee is here to help!

Free-to-play UE 5.6 Extraction Battle Royale in 500 km² neo-futuristic world with destructible environment and vehicles, massive ET-ACUs, armored Aliens, ferocious Monsters, heavily armed MetaHumans, complete missions to attack, defend, loot, extract facing dynamic weathers.

From a small village of a dozen people to a small kingdom of thousands of people. Arrange for residents to work, gathering, fishing and hunting, farming and mining, processing and manufacturing. Trade, accumulate supplies, increase your strength, and fight evil forces and monsters.

Pilot devastating combat mechs, fly through massive sci-fi battlefields, unleash tactical nukes, and destroy enemy machines in this fast-paced arcade FPS built for chaos, speed, and domination

An asteroid is hurtling toward the planet! Sneak, scavenge and blast your way through an immersive prehistoric world filled with Humans, Dinosaurs, Droids and Mother Nature’s fury!

A first person social deduction game, combining real time action and communication, playable up to 16 players. While most players will cooperate to complete objectives to ensure victory, a small portion of dissidents will try their best to stop them at all cost, without being caught.

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.

Master the art of driving! Enjoy 50+ handcrafted levels with 9 vehicles and realistic car physics. No traffic — just pure driving skills. Unlock cars, test your skills in mini-games, or just drive casually without any worries!

A sci-fi 80s retro shooter and bullet hell. Use your plasma cannon and bombs to repell an alien invasion. Either defeat the alien robots building and upgrading the blocks and turrets - or blow all of their blocks up! 20 straightforward levels.

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.

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.

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.

Sol Cesto is a tactical and frantic roguelite where mastering your luck is key. Choose a hero, upgrade them using cursed teeth and magical items, and descend to the bottom of an ever-changing dungeon. In this dark world, every action has consequences…

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.

CONVRGENCE is an atmospheric VR extraction shooter set in the procedurally generated, ever-changing Chernokamensk Anomaly Zone. Scavenge loot, fight bandits and hunt for mystical artifacts — all with your loyal dog companion by your side. But extract before nightfall, or face what lurks in the dark.

Race through the streets in this third-person action runner, dodging obstacles or shooting them out of your way. Collect points, purchase powerful upgrades, and optimize your run to beat your high score. Can you make it to the top of the leaderboard?

Unleash mayhem in this bloody, hand-drawn roguelike where Christmas meets metal and Santa fights for survival!

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.

Continue the adventures of Beatrix LeBeau as she journeys across the Slime Sea to Rainbow Island, a land brimming with ancient mysteries, and bursting with wiggly, new slimes to wrangle in this sequel to the smash-hit, Slime Rancher.

Build your crappy vehicle into a race car, install the parts yourself. Make money by cutting wood, racing at night or delivering pizza. Maybe you want to manage a sugar shack or build yourself a big garage?

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.

Dungeon Clawler is a Roguelike Claw Machine Deckbuilder. Build your deck, grab weapons and items from the claw machine to battle enemies, discover powerful perks that create game-changing synergies and unleash crazy combos as you fight your way through the dungeon!

A 4-player online co-op survival horror game. Avoid the contaminated rain, gather scrap and get back to the tram. Monsters that copy your friends' voices and behavior, and many other threats, stand in your way. Gear up and stick together to survive.

No Emergency: Pestilence plunges players into the epicenter of a mysterious epidemic, where every arriving patient could be carrying a mutating pathogen, and a single mistake in a prescription turns the cure into poison.

BOXROOM allows you to design, define and decorate a room - a sanctuary - for your Steam library, and then revel in the organisation of your game collection.

"Lost Castle 2" is a 2D Beat'em up Rogue-Lite game. Explore abundant treasures and items to enhance yourself, master various weapons to showcase your skills, and challenge powerful monsters to demonstrate your strength. A new adventure is calling for treasure hunters!

Starship Theory is a ship building survival game. Mine and trade to gather resources. Plan and construct new upgrades. Train and manage crew. Fight to survive.