Games like X-COM: Enforcer

This is a fight for survival. Xenomorphs swarm in overwhelming numbers. Every room could be your last.

A sci-fi space vehicle combat game, where the player must defend their capital ship from being destroyed, while attempting to destroy the alien force's own capital ship!

The Galaxy’s Last Line of Offence. Enlist in the Helldivers and join the fight for freedom across a hostile galaxy in a fast, frantic, and ferocious third-person shooter.

Type: Science fiction and theology style FPS multiplayer shooting game; Topic: Discovering the Truth of the Universe in the Future of Humanity and Its Impact on the Evolution of Human Bones; Modes: PVE (Gun Shooting Battle and Summoning Flying Shuttle Battle), PVP (Gun Shooting Battle).

In the future, you must retrieve a stolen hyper-advanced CPU from the CyberQuark Corporation before they use it to create destructive AI robots. In Parkour Chief: Secret Agent, you'll use your parkour and stealth skills to infiltrate CyberQuark's headquarters and recover the CPU.

Bring In Your Bounty, Dead or Alive

Kill Invaders - Dive into a thrilling multiplayer FPS with an alien storyline. Defend Earth in a battle against extraterrestrial invaders! Single Player, Multiplayer, Deathmatch and Battle Royale Modes !

The Dream is a minimal extraction adventure game, enter a dystopian vision in a post world war 3 set in Barcelona 2033. Survive, explore and clean the radioactive AI slop in Barcelona . Warning there is AI dropping slop everywhere, join the heroes of the plaza and save the city

Gear up for tactical mech action in War Robots: Frontiers, a free-to-play multiplayer mech shooter. Construct and customize, squad up with Pilots online, and fire up your engines in massive intergalactic battles.

Action RPG Shooter with Base Management elements, featuring AI NPCs. Take charge of an abandoned outpost, explore a lush alien planet, battle fierce creatures, gather resources, and upgrade your base as you develop your character and bring dozens of distinct weapons to bear.

P.R.O.T.O.C.O.O.L. It is a multiplayer TPS game with fantastic and colorful graphics, developed by a small team. Fight across multiple game modes and ever-growing maps. Take to the Field, Fight and Survive!

Alien: Rogue Incursion is an all-new action-horror VR game that transforms you into ex-Colonial Marine Zula Hendricks on a dangerous mission to the uncharted planet Purdan, featuring innovative real-life motion gameplay, a whole-body loadout, and the most cunning Xenomorphs ever encountered.

Fight against rebel robots together with your friends and save planets from invasion....

Former FBI agent and fishing enthusiast, faces an alien-zombie apocalypse after a virus escapes from NASA. Determined to rescue his wife, he defies the FBI and embarks alone to confront the threat. An epic rescue mission filled with action and suspense!

Team up and take flight in this sci-fi co-op shooter with fully destructible environments. Soar through dynamic open levels using powerful abilities, master advanced weapons and vehicles, and lay waste to the armies of a hostile colonizing threat - defend your home worlds!

6-player co-op survival horror at its finest! Cyborg, monsters and aliens. Free updates

"Lone Shadow" is a third-person shooter game.

Battle for survival against endless alien hordes with your friends! The Anacrusis is a first-person shooter that dynamically adjusts difficulty to you. Experience intense 1-4 player co-op action or play as the aliens and stop your friends in 1-8 player Versus mode. Full Steam Workshop support!