Games like Glass Monsters
Games like Glass Monsters include Fistful of Frags, Left 4 Dead 2, Deep Rock Galactic, THE FINALS, and Counter-Strike 2. We matched them by the tags players give Glass Monsters on Steam (Arena Shooter, FPS, Idler, Horror, and PvE): closest matches first, and among equally close ones the better-known games.

Fistful of Frags
Shared: Arena Shooter · FPS · PvE

Left 4 Dead 2
Shared: FPS · Action · Shooter

Deep Rock Galactic
Shared: FPS · PvE · Shooter

THE FINALS
Shared: FPS · Destruction · Shooter

Counter-Strike 2
Shared: FPS · Shooter · Action

Ready or Not
Shared: FPS · Horror · Shooter

METRO 2033 Redux
Shared: FPS · Horror · Action

METRO Last Light Redux
Shared: FPS · Horror · Action

Metro Exodus
Shared: FPS · Horror · Action

PUBG: BATTLEGROUNDS
Shared: FPS · Shooter · Action

Devil Daggers
Shared: FPS · Horror · Arena Shooter

DOOM
Shared: FPS · Action · Shooter

Echo Point Nova
Shared: FPS · Arena Shooter · Shooter

Black Mesa
Shared: FPS · Action · Shooter

Resident Evil Requiem
Shared: Horror · FPS · Action

Call of Duty®
Shared: FPS · Action · Shooter

DOOM 3
Shared: FPS · Horror · Action

Half-Life: Alyx
Shared: FPS · Horror · Shooter

Killing Floor 3
Shared: FPS · PvE · Horror

Trepang2
Shared: FPS · Horror · Shooter

CULTIC
Shared: FPS · Action · Horror

Back 4 Blood
Shared: FPS · Horror · Action

Half-Life 2
Shared: FPS · Action · Shooter

Battlefield™ 2042
Shared: FPS · Shooter · Action