Online co-op Aliens games

Every online co-op Aliens game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 21–30 of 138 games matching Aliens · updated 12 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 1–8 players
Reviews
83% of 1,027

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.

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Free
Released
Price
Free
Players
👥 Up to 4 players
Reviews
0% of 2

A free co-op automation game where you and up to 3 friends grow a living mycelial network across an alien planet. Consume local creatures, build biological production chains, and evolve from a tiny spore into a cosmic entity together.

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$
Released
Price
$ · Cheap
Players
👥 Up to 5 players
Reviews
100% of 4

Galaksia Online is an action-packed, 2D multiplayer space MMORPG blending retro pixel art aesthetics with mechanics. Forge alliances, custom-build your starships block by block, and engage in massive faction-based PvP wars or challenging PvE raid battles across dangerous stellar sectors.

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
75% of 4

Humanity’s Sun is destabilising. Worlds are on fire. A Solar-wide evacuation has begun. Earth’s military force—The Lunar Corps—prepares the colonisation of our new star system: Arcadia. But rising distress calls and radio silence hint at an unseen enemy lurking in the shadows...

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$
Released
Price
$ · Cheap
Players
👥 Not stated

The Fibrous - Sci-Fi Online or Single-Player TPS (Over-The-Shoulder) covering the story of an ex-marine recruited by what's left of the military to help take back Earth after a meteor crash-lands into Earth and aliens with fiber-like skin emerge, thinking they can take this planet for their own.

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$$
Released
Price
$$ · Standard
Players
👥 Up to 4 players

Co-op or solo sci-fi horror. Purge a biological outbreak with flamethrowers & grenades. Explore infested zones, grab keycards & stuff, then trigger the protocol to burn the Mother Organism. Team up. Erase the threat

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$
Released
Price
$ · Cheap
Players
👥 Not stated

A sci-fi RPG strategy game where you build fleet, attack, trade and explore space. You can fight yourself, have others help you and upgrade your ship or buy plethora of ships for your space garage.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 2–8 players
Reviews
60% of 5

Conquer. Control. Dominate. A fast-paced, competitive territory game where every tile you claim brings you closer to victory, and every second of inattention can turn the tide completely.