Games like Putrefaction 2: Void Walker
Games like Putrefaction 2: Void Walker include DOOM, DOOM Eternal, ULTRAKILL, Devil Daggers, and Black Mesa. We matched them by the tags players give Putrefaction 2: Void Walker on Steam (Action, Arena Shooter, Shooter, Indie, and FPS): closest matches first, and among equally close ones the better-known games.

DOOM
Shared: Action · FPS · Shooter

DOOM Eternal
Shared: Action · FPS · Gore

ULTRAKILL
Shared: FPS · Arena Shooter · Gore

Devil Daggers
Shared: Action · FPS · Indie

Black Mesa
Shared: Action · FPS · Shooter

Half-Life 2
Shared: Action · FPS · Shooter

DUSK
Shared: Shooter · FPS · Horror

Trepang2
Shared: Shooter · FPS · Action

Quake
Shared: Action · FPS · Shooter

DOOM 3
Shared: Action · FPS · Shooter

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

Half-Life
Shared: FPS · Action · Shooter

Quake III Arena
Shared: Arena Shooter · Action · FPS

DOOM 3
Shared: Action · FPS · Horror

DOOM 64
Shared: Action · FPS · Shooter

DOOM + DOOM II
Shared: Action · FPS · Classic

Serious Sam 4
Shared: Action · Gore · Shooter

Left 4 Dead 2
Shared: Shooter · FPS · Action

Quake II
Shared: Action · FPS · Shooter

Deathmatch Classic
Shared: Action · FPS · Shooter

Quake 4
Shared: Action · Shooter · FPS

Painkiller: Black Edition
Shared: Action · Gore · Shooter

Quake Live
Shared: Arena Shooter · FPS · Action

DOOM: The Dark Ages
Shared: Action · FPS · Gore