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 11–20 of 138 games matching Aliens · updated 12 Oct 2026

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$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
100% of 3

A 4-player co-op survival defense roguelite. By day, gather resources and build your base. By night, hold the line against endless waves. Gunners cannot build. Engineers cannot shoot. Survive all 30 nights together, or fall apart alone.

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$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
100% of 1

Catnip Wars is a 1–4 player co-op tower defense. Play as scrappy Catbots defending your catnip farm from monster waves — build and power turrets, raise walls, harvest resources, man the BFG, revive fallen friends, and climb the tech tree. Play solo or online with friends. Achievements/Leaderboard

Free
Released
Price
Free
Players
👥 Up to 2 players
Reviews
94% of 35

Experience Crushing Co-op Carnage in CRAWLER: A VR Mech Horde Shooter. Blast through hordes of acid-spitting bugs as you earn cash and extract from randomly generated missions. Upgrade your mech’s arsenal back at base while scrambling to meet the needs of an ever-growing quota.

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$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
48% of 27

An open-world sandbox survival game set after a devastating alien invasion. Scavenge for resources, craft, build defenses, and harness alien technology to fight back. Play solo or in co-op and reclaim what’s left of the planet.

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
100% of 4

A colorful, screen-wrapping arcade space shooter for solo, local, and online multiplayer. Dodge asteroids, blast enemies, collect powerful abilities, and build a one-of-a-kind ship—alone or with questionably helpful friends.

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Free
Released
Price
Free
Players
👥 Up to 2 players
Reviews
100% of 7

Grab your friend and play together as an angel and a demon fighting to stop an alien invasion. Strategize builds, communicate plans, and execute tactics in order to come out on top. Show those aliens who's the real boss of the humans!

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$
Released
Price
$ · Cheap
Players
👥 Up to 12 players
Reviews
97% of 49

NOW WITH PUBLIC LOBBIES! Blend into the environment and eat objects around you as a sneaky Mimic, or burn, zap, and explode everything as a crafty Exterminator to root out the Mimics in this Prop-Hunt inspired multiplayer game of chaos and frenetic fun!

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$$$
Released
Price
$$$ · Expensive
Players
👥 Up to 4 players
Reviews
60% of 12,886

Halo: Campaign Evolved is a faithful yet modernized remake of Halo: Combat Evolved’s campaign, rebuilt from the ground up.

$
Released
Price
$ · Cheap
Players
👥 1–8 players
Reviews
83% of 6

Use the bathroom or defend your home from zombies? The choice is yours! Be Human... Or Die trying is a 1-8 player co-op defense game where killing zombies is just as important as taking a shower. Also did I mention that you play an alien in a mech suit? Yeah it's a weird game like that.

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