Games like Polygon of Reality
Games like Polygon of Reality include SOMA, Darkwood, Resident Evil 4, Resident Evil Village, and Resident Evil 2. We matched them by the tags players give Polygon of Reality on Steam (Horror, Survival Horror, Action, Nonlinear, and Atmospheric): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Atmospheric · Survival Horror

Darkwood
Shared: Horror · Survival Horror · Action

Resident Evil 4
Shared: Horror · Survival Horror · Action

Resident Evil Village
Shared: Horror · Survival Horror · Action

Resident Evil 2
Shared: Survival Horror · Horror · Action

Poppy Playtime
Shared: Horror · Survival Horror · Dark

Dead Space (2008)
Shared: Horror · Action · Survival Horror

Outlast
Shared: Horror · Survival Horror · Atmospheric

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · Multiple Endings

Little Nightmares
Shared: Horror · Atmospheric · Dark

Lethal Company
Shared: Horror · Survival Horror · Atmospheric

Resident Evil 7 Biohazard
Shared: Horror · Survival Horror · Atmospheric

SILENT HILL 2
Shared: Horror · Survival Horror · Atmospheric

Bendy and the Ink Machine
Shared: Horror · Survival Horror · Dark

INSIDE
Shared: Horror · Atmospheric · Dark

Outlast 2
Shared: Horror · Survival Horror · Dark

Bendy and the Dark Revival
Shared: Horror · Action · Survival Horror

Pacify
Shared: Horror · Survival Horror · Dark

Inside the Backrooms
Shared: Horror · Survival Horror · Atmospheric

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

Resident Evil Requiem
Shared: Survival Horror · Horror · Action

Sally Face - Episode One
Shared: Horror · Dark · Story Rich

Alan Wake
Shared: Horror · Action · Atmospheric

The Forest
Shared: Horror · Survival Horror · Action