Games like [SUBJECT]
Games like [SUBJECT] include Mouthwashing, SOMA, Poppy Playtime, Summer of '58, and Layers of Fear (2016). We matched them by the tags players give [SUBJECT] on Steam (Horror, Thriller, Atmospheric, Psychological Horror, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Poppy Playtime
Shared: Horror · Psychological Horror · Dark

Summer of '58
Shared: Horror · Thriller · Atmospheric

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

ROUTINE
Shared: Atmospheric · Psychological Horror · Horror

What Remains of Edith Finch
Shared: Atmospheric · Walking Simulator · Mystery

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

Firewatch
Shared: Atmospheric · Walking Simulator · Adventure

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Fears to Fathom - Ironbark Lookout
Shared: Horror · Atmospheric · Psychological Horror

Still Wakes the Deep
Shared: Horror · Psychological Horror · Walking Simulator

KARMA: The Dark World
Shared: Horror · Psychological Horror · Walking Simulator

Amnesia: A Machine For Pigs
Shared: Horror · Atmospheric · Walking Simulator

Little Nightmares II
Shared: Horror · Atmospheric · Psychological Horror

Firework
Shared: Horror · Psychological Horror · Atmospheric

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

Lethal Company
Shared: Horror · Psychological Horror · Atmospheric

The Park®
Shared: Horror · Psychological Horror · Walking Simulator

Phasmophobia
Shared: Horror · Psychological Horror · Dark

Fears to Fathom - Norwood Hitchhike
Shared: Horror · Psychological Horror · Atmospheric

Inside the Backrooms
Shared: Horror · Psychological Horror · Atmospheric

Detention
Shared: Horror · Atmospheric · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · Atmospheric