Games like Cosmic Purge
Games like Cosmic Purge include DOOM, DOOM Eternal, DOOM: The Dark Ages, Counter-Strike 2, and Call of Duty®. We matched them by the tags players give Cosmic Purge on Steam (Action, Dark Fantasy, Lovecraftian, Shooter, and Demons): closest matches first, and among equally close ones the better-known games.

DOOM
Shared: Action · FPS · Shooter

DOOM Eternal
Shared: Action · FPS · Demons

DOOM: The Dark Ages
Shared: Action · Dark Fantasy · Demons

Counter-Strike 2
Shared: Shooter · Action · FPS

Call of Duty®
Shared: Action · Shooter · FPS

BioShock Infinite
Shared: Action · Shooter · FPS

Team Fortress 2
Shared: Action · Shooter · FPS

Apex Legends™
Shared: Shooter · Action · FPS

Halo Infinite
Shared: Action · Shooter · FPS

The Darkness II
Shared: Action · FPS · Shooter

Call of Duty®: Warzone™
Shared: Action · FPS · Shooter

Aimlabs
Shared: Action · Shooter · FPS

DOOM 3
Shared: Action · FPS · Dark

Metal: Hellsinger
Shared: FPS · Action · Shooter

DOOM 3
Shared: Action · FPS · Shooter

Black Mesa
Shared: Action · FPS · Shooter

Half-Life 2
Shared: Action · FPS · Shooter

Battlefield™ 1
Shared: FPS · Action · Shooter

Paladins®
Shared: Action · Shooter · FPS

Enlisted
Shared: Action · FPS · Shooter

METRO 2033 Redux
Shared: Action · FPS · Shooter

Wolfenstein II: The New Colossus
Shared: Action · FPS · Shooter

Left 4 Dead 2
Shared: Action · Shooter · FPS

RoboCop: Rogue City
Shared: Action · FPS · Shooter