Games like Primordial Pain
Games like Primordial Pain include Post Void, Pixel Gun 3D: PC Edition, Devil Daggers, AMID EVIL, and ULTRAKILL. We matched them by the tags players give Primordial Pain on Steam (Arena Shooter, First-Person, Psychedelic, Pixel Graphics, and FPS): closest matches first, and among equally close ones the better-known games.

Post Void
Shared: Psychedelic · FPS · First-Person

Pixel Gun 3D: PC Edition
Shared: Pixel Graphics · FPS · First-Person

Devil Daggers
Shared: FPS · Arena Shooter · Difficult

AMID EVIL
Shared: Arena Shooter · FPS · First-Person

ULTRAKILL
Shared: Arena Shooter · FPS · First-Person

Aimlabs
Shared: FPS · First-Person · Shooter

Shotgun Farmers
Shared: First-Person · FPS · Arena Shooter

Echo Point Nova
Shared: Arena Shooter · FPS · First-Person

BRAZILIAN DRUG DEALER 3: I OPENED A PORTAL TO HELL IN THE FAVELA TRYING TO REVIVE MIT AIA I NEED TO CLOSE IT
Shared: Arena Shooter · FPS · First-Person

Warhammer 40,000: Boltgun
Shared: FPS · Pixel Graphics · First-Person

Deep Rock Galactic
Shared: FPS · PvE · First-Person

Squad
Shared: FPS · First-Person · PvE

THE FINALS
Shared: FPS · First-Person · Arena Shooter

How to Fish
Shared: First-Person · FPS · Shooter

Starship Troopers: Extermination
Shared: First-Person · FPS · PvE

Counter-Strike: Source
Shared: FPS · First-Person · Shooter

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

HYPER DEMON
Shared: Arena Shooter · FPS · Psychedelic

DOOM
Shared: FPS · First-Person · Shooter

Cruelty Squad
Shared: FPS · Psychedelic · First-Person

Mycopunk
Shared: FPS · Colorful · PvE

Fashion Police Squad
Shared: Arena Shooter · FPS · First-Person

SUPERHOT
Shared: FPS · First-Person · Action

GoreBox
Shared: FPS · First-Person · PvE