Games like Apastron
Games like Apastron include Bright Memory, Half-Life 2, Half-Life: Alyx, Halo Infinite, and Bright Memory: Infinite. We matched them by the tags players give Apastron on Steam (FPS, Looter Shooter, Female Protagonist, Sci-fi, and Open World): closest matches first, and among equally close ones the better-known games.

Bright Memory
Shared: FPS · Female Protagonist · Shooter

Half-Life 2
Shared: FPS · Sci-fi · Shooter

Half-Life: Alyx
Shared: FPS · Female Protagonist · Shooter

Halo Infinite
Shared: FPS · Shooter · Singleplayer

Bright Memory: Infinite
Shared: Female Protagonist · FPS · Sci-fi

Cyberpunk 2077
Shared: Open World · FPS · Sci-fi

Destiny 2
Shared: Looter Shooter · Open World · FPS

Fallout 4
Shared: Open World · Singleplayer · Shooter

Black Mesa
Shared: FPS · Sci-fi · Shooter

BioShock Infinite
Shared: FPS · Shooter · Singleplayer

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: FPS · Open World · Shooter

Far Cry 3
Shared: FPS · Open World · Shooter

Half-Life
Shared: FPS · Sci-fi · Shooter

Selaco
Shared: FPS · Female Protagonist · Shooter

Metro Exodus
Shared: FPS · Open World · Singleplayer

Fallout: New Vegas
Shared: Open World · Singleplayer · FPS

Borderlands 3
Shared: Looter Shooter · FPS · Open World

Far Cry® 4
Shared: FPS · Open World · Shooter

Borderlands 2
Shared: Looter Shooter · Shooter · FPS

Atomic Heart
Shared: FPS · Open World · Singleplayer

RoboCop: Rogue City
Shared: FPS · Singleplayer · Shooter

Half-Life: Opposing Force
Shared: FPS · Sci-fi · Shooter

Far Cry® New Dawn
Shared: FPS · Open World · Shooter

Red Dead Redemption 2
Shared: Open World · Story Rich · Shooter

