Games like What You Didn't See
Games like What You Didn't See include SILENT HILL 2, SILENT HILL f, No, I'm not a Human, Darkwood, and Outlast. We matched them by the tags players give What You Didn't See on Steam (Psychological Horror, Philosophical, Psychological, Horror, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

SILENT HILL 2
Shared: Psychological Horror · Horror · Psychological

SILENT HILL f
Shared: Psychological Horror · Horror · Survival Horror

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

Darkwood
Shared: Psychological Horror · Horror · Survival Horror

Outlast
Shared: Horror · Psychological Horror · Survival Horror

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

The Forest
Shared: Horror · Survival · Survival Horror

SOMA
Shared: Psychological Horror · Horror · Story Rich

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

Poppy Playtime
Shared: Horror · Psychological Horror · Survival Horror

Escape the Backrooms
Shared: Psychological Horror · Horror · Survival Horror

Outlast 2
Shared: Psychological Horror · Horror · Survival Horror

The Beast Inside
Shared: Horror · Psychological Horror · Survival Horror

The Coffin of Andy and Leyley
Shared: Psychological · Psychological Horror · Multiple Endings

The Dark Pictures Anthology: Little Hope
Shared: Horror · Psychological Horror · Multiple Endings

Dark Deception
Shared: Horror · Psychological Horror · Survival Horror

Getting Over It with Bennett Foddy
Shared: Psychological Horror · Philosophical · Horror

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

Lethal Company
Shared: Horror · Psychological Horror · Survival Horror

The Evil Within 2
Shared: Psychological Horror · Horror · Survival Horror

Resident Evil 4
Shared: Horror · Survival Horror · Survival

Subnautica 2
Shared: Horror · Survival · Survival Horror

The Test
Shared: Psychological Horror · Multiple Endings · Psychological

SILENT HILL: Townfall
Shared: Psychological Horror · Horror · Adventure