Games like Deadness
Games like Deadness include Half-Life: Alyx, Left 4 Dead 2, Resident Evil 7 Biohazard, Ready or Not, and Resident Evil Village. We matched them by the tags players give Deadness on Steam (FPS, Shooter, Action-Adventure, Horror, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

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

Left 4 Dead 2
Shared: FPS · Shooter · Horror

Resident Evil 7 Biohazard
Shared: Horror · VR · First-Person

Ready or Not
Shared: FPS · Shooter · Horror

Resident Evil Village
Shared: Horror · First-Person · FPS

DOOM
Shared: FPS · Shooter · Action

METRO 2033 Redux
Shared: FPS · Horror · Shooter

Trepang2
Shared: Shooter · FPS · Horror

Pavlov
Shared: Shooter · VR · FPS

BioShock Infinite
Shared: Shooter · FPS · Action

METRO Last Light Redux
Shared: FPS · Horror · Shooter

Phasmophobia
Shared: Horror · VR · Psychological Horror

Black Mesa
Shared: FPS · Shooter · Action

Metro Exodus
Shared: FPS · Horror · Shooter

Call of Duty®: Black Ops III
Shared: FPS · Shooter · First-Person

Half-Life 2
Shared: FPS · Shooter · Action

Atomic Heart
Shared: FPS · Action-Adventure · Horror

F.E.A.R.
Shared: FPS · Horror · Shooter

Wolfenstein: The Old Blood
Shared: FPS · Shooter · Action

Resident Evil Requiem
Shared: FPS · Horror · Action-Adventure

Far Cry® 5
Shared: Action-Adventure · FPS · Shooter

Crisol: Theater of Idols
Shared: FPS · Shooter · Horror

Outlast
Shared: Horror · First-Person · Psychological Horror

DOOM Eternal
Shared: FPS · Shooter · Action