Games like Idea Fix
Games like Idea Fix include MiSide, SOMA, Outlast, Mouthwashing, and No, I'm not a Human. We matched them by the tags players give Idea Fix on Steam (Simulation, Relaxing, Physics, Atmospheric, and Psychological Horror): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · First-Person · Atmospheric

SOMA
Shared: Atmospheric · Psychological Horror · Horror

Outlast
Shared: Atmospheric · First-Person · Psychological Horror

Mouthwashing
Shared: Psychological Horror · Atmospheric · Horror

No, I'm not a Human
Shared: Psychological Horror · Atmospheric · Horror

Iron Lung
Shared: Atmospheric · Psychological Horror · Horror

Layers of Fear (2016)
Shared: Atmospheric · Psychological Horror · First-Person

PEAK
Shared: Physics · Adventure · First-Person

Berry Bury Berry
Shared: Physics · Psychological Horror · First-Person

Lethal Company
Shared: First-Person · Horror · Psychological Horror

Crime Scene Cleaner
Shared: Simulation · Relaxing · First-Person

DrainSim
Shared: Simulation · Relaxing · Physics

Scanner Sombre
Shared: Atmospheric · Psychological Horror · First-Person

[Chillas Art] The Convenience Store
Shared: Simulation · Psychological Horror · Atmospheric

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Story Rich

Firewatch
Shared: Atmospheric · Adventure · First-Person

Little Nightmares
Shared: Atmospheric · Horror · Adventure

MOLE
Shared: Simulation · Psychological Horror · Atmospheric

Still Wakes the Deep
Shared: Psychological Horror · First-Person · Horror

Sally Face - Episode One
Shared: Psychological Horror · Atmospheric · Story Rich

Slime Rancher 2
Shared: Relaxing · Simulation · First-Person

Outlast 2
Shared: Psychological Horror · First-Person · Atmospheric

Amnesia: The Dark Descent
Shared: Psychological Horror · Atmospheric · Horror

Little Nightmares II
Shared: Atmospheric · Adventure · Psychological Horror