Games like Red or Blue
Games like Red or Blue include The Cabin Factory, No, I'm not a Human, Quarantine Zone: The Last Check, Outlast, and MiSide. We matched them by the tags players give Red or Blue on Steam (Choices Matter, Simulation, Atmospheric, Roguelike, and Immersive Sim): closest matches first, and among equally close ones the better-known games.

The Cabin Factory
Shared: Choices Matter · Atmospheric · Immersive Sim

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

Quarantine Zone: The Last Check
Shared: Simulation · Choices Matter · First-Person

Outlast
Shared: Atmospheric · First-Person · Horror

MiSide
Shared: Psychological Horror · First-Person · Atmospheric

Pathologic 3
Shared: Atmospheric · Choices Matter · Psychological Horror

Poppy Playtime
Shared: First-Person · Horror · Survival Horror

Five Nights at Freddy's
Shared: Horror · Survival Horror · Psychological Horror

Buckshot Roulette
Shared: First-Person · Horror · Psychological

CloverPit
Shared: Roguelike · First-Person · Psychological Horror

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

The Test
Shared: Simulation · Choices Matter · Psychological

Garten of Banban
Shared: First-Person · Psychological Horror · Horror

Backrooms: Escape Together
Shared: Atmospheric · Psychological Horror · First-Person

Amnesia: The Bunker
Shared: Atmospheric · Immersive Sim · First-Person

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

HELLMART
Shared: Simulation · Choices Matter · Immersive Sim

The Horrorscope
Shared: Simulation · Atmospheric · Choices Matter

Lethal Company
Shared: First-Person · Horror · Atmospheric

[Chillas Art] Parasocial
Shared: Choices Matter · Atmospheric · Immersive Sim

PC Building Simulator
Shared: Simulation · Immersive Sim · First-Person

SOMA
Shared: Atmospheric · Psychological Horror · Horror

Amnesia: The Dark Descent
Shared: Atmospheric · Psychological Horror · First-Person

X-Plane 12
Shared: Simulation · Immersive Sim · 3D