Games like Fentanyl Edition
Games like Fentanyl Edition include Fallout 4, POSTAL: Brain Damaged, ULTRAKILL, MULLET MADJACK, and Anger Foot. We matched them by the tags players give Fentanyl Edition on Steam (Psychedelic, Exploration, Atmospheric, Boomer Shooter, and Stylized): closest matches first, and among equally close ones the better-known games.

Fallout 4
Shared: Exploration · Atmospheric · Singleplayer

POSTAL: Brain Damaged
Shared: Boomer Shooter · Atmospheric · Stylized

ULTRAKILL
Shared: Fast-Paced · Boomer Shooter · Singleplayer

MULLET MADJACK
Shared: Boomer Shooter · Fast-Paced · Singleplayer

Anger Foot
Shared: Boomer Shooter · Fast-Paced · Shooter

Cairn
Shared: Exploration · Stylized · Atmospheric

Post Void
Shared: Psychedelic · Fast-Paced · Shooter

Echo Point Nova
Shared: Exploration · Shooter · Stylized

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Atmospheric · Exploration · Singleplayer

Forgive Me Father
Shared: Boomer Shooter · Shooter · Stylized

COCOON
Shared: Exploration · Atmospheric · Stylized

Firewatch
Shared: Atmospheric · Exploration · Singleplayer

DUSK
Shared: Boomer Shooter · Fast-Paced · Shooter

The Witness
Shared: Exploration · Atmospheric · Singleplayer

Trepang2
Shared: Singleplayer · Shooter · Fast-Paced

Serious Sam: Siberian Mayhem
Shared: Boomer Shooter · Atmospheric · Shooter

DOOM Eternal
Shared: Fast-Paced · Shooter · Singleplayer

Chants of Sennaar
Shared: Singleplayer · Atmospheric · Stylized

AMID EVIL
Shared: Boomer Shooter · Psychedelic · Shooter

BioShock Infinite
Shared: Shooter · Singleplayer · Atmospheric

The Long Dark
Shared: Exploration · Atmospheric · Singleplayer

DOOM
Shared: Shooter · Fast-Paced · Singleplayer

Metro Exodus
Shared: Atmospheric · Singleplayer · Exploration

Stray
Shared: Atmospheric · Exploration · Singleplayer