Games like Withered Haven
Games like Withered Haven include SOMA, Layers of Fear (2016), Mouthwashing, Outlast, and Poppy Playtime. We matched them by the tags players give Withered Haven on Steam (Horror, Psychological Horror, Dark, Atmospheric, and Realistic): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Atmospheric

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

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · Psychological Horror · Atmospheric

Poppy Playtime
Shared: Horror · Dark · Psychological Horror

Visage
Shared: Horror · Psychological Horror · Dark

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

Outlast 2
Shared: Horror · Psychological Horror · Dark

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

Little Nightmares II
Shared: Horror · Dark · Psychological Horror

Little Nightmares
Shared: Horror · Atmospheric · Dark

Sally Face - Episode One
Shared: Psychological Horror · Horror · Dark

MiSide
Shared: Psychological Horror · Horror · Story Rich

Firewatch
Shared: Atmospheric · Story Rich · First-Person

Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Psychological Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · Dark

Blair Witch
Shared: Horror · Psychological Horror · Indie

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

Bendy and the Ink Machine
Shared: Horror · First-Person · Dark

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

Fran Bow
Shared: Psychological Horror · Horror · Dark

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

Among the Sleep - Enhanced Edition
Shared: Horror · Atmospheric · Indie

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