Games like Asphyxiation
Games like Asphyxiation include Outlast, Poppy Playtime, Ultimate Custom Night, Cry of Fear, and Garten of Banban. We matched them by the tags players give Asphyxiation on Steam (Walking Simulator, Roguelike, 3D, Horror, and Procedural Generation): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · First-Person · Atmospheric

Poppy Playtime
Shared: Horror · First-Person · Free to Play

Ultimate Custom Night
Shared: Horror · Free to Play · First-Person

Cry of Fear
Shared: Horror · Free to Play · Atmospheric

Garten of Banban
Shared: Horror · First-Person · 3D

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

Dark Deception
Shared: Horror · First-Person · Free to Play

The Forest
Shared: Horror · Survival · First-Person

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

Monstrum
Shared: Horror · Roguelike · First-Person

Five Nights at Freddy's: Security Breach
Shared: Horror · First-Person · 3D

Only If
Shared: Horror · First-Person · Walking Simulator

Lethal Company
Shared: Horror · First-Person · Procedural Generation

Baldi's Basics Plus
Shared: Roguelike · Horror · Procedural Generation

Slender: The Arrival
Shared: Horror · First-Person · Walking Simulator

No More Room in Hell
Shared: Horror · Free to Play · Action

The Hat Man: Shadow Ward
Shared: Horror · First-Person · Walking Simulator

The Beast Inside
Shared: Horror · First-Person · Action

Daylight
Shared: Horror · First-Person · Walking Simulator

Outlast 2
Shared: Horror · First-Person · Atmospheric

Bendy and the Dark Revival
Shared: Horror · First-Person · Action

METRO 2033 Redux
Shared: Horror · Atmospheric · Action

R.E.P.O.
Shared: Horror · 3D · First-Person

Buckshot Roulette
Shared: Horror · First-Person · 3D

