Games like All Systems Operational
Games like All Systems Operational include HELLDIVERS™ 2, STAR WARS™ Battlefront™ II, Counter-Strike 2, Returnal™, and Bit Blaster XL. We matched them by the tags players give All Systems Operational on Steam (Female Protagonist, Shoot 'Em Up, Bullet Hell, Shooter, and Sci-fi): closest matches first, and among equally close ones the better-known games.

HELLDIVERS™ 2
Shared: Shooter · Online Co-Op · Sci-fi

STAR WARS™ Battlefront™ II
Shared: Shooter · Sci-fi · Space

Counter-Strike 2
Shared: Shooter · Multiplayer · Action

Returnal™
Shared: Bullet Hell · Female Protagonist · Sci-fi

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Among Us
Shared: Space · Online Co-Op · 2D

Guns, Gore and Cannoli 2
Shared: Side Scroller · Shoot 'Em Up · Shooter

Deep Rock Galactic
Shared: Shooter · Co-op · Sci-fi

PUBG: BATTLEGROUNDS
Shared: Shooter · Multiplayer · Online Co-Op

ARC Raiders
Shared: Shooter · Sci-fi · Multiplayer

Risk of Rain Returns
Shared: 2D · Online Co-Op · Sci-fi

DRAINUS
Shared: Shoot 'Em Up · Shooter · Female Protagonist

Starship Troopers: Extermination
Shared: Sci-fi · Online Co-Op · Action

Dead Space™ 3
Shared: Sci-fi · Shooter · Online Co-Op

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Female Protagonist · Bullet Hell

Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Borderlands 2
Shared: Shooter · Co-op · Loot

Left 4 Dead 2
Shared: Shooter · Co-op · Online Co-Op

Marathon
Shared: Sci-fi · Shooter · Futuristic

ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Call of Duty®: Black Ops III
Shared: Shooter · Multiplayer · Futuristic

Aliens: Colonial Marines Collection
Shared: Sci-fi · Shooter · Co-op

STAR WARS™ Battlefront
Shared: Shooter · Sci-fi · Space

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Shooter · Sci-fi · Multiplayer