Games like Mannequin The Passing
Games like Mannequin The Passing include Layers of Fear (2016), Poppy Playtime, Mouthwashing, Garten of Banban, and Firework. We matched them by the tags players give Mannequin The Passing on Steam (Horror, Psychological Horror, Atmospheric, Walking Simulator, and Singleplayer): closest matches first, and among equally close ones the better-known games.

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

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Firework
Shared: Horror · Psychological Horror · Atmospheric

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

Outlast
Shared: Horror · Atmospheric · Psychological Horror

MiSide
Shared: Psychological Horror · Horror · Singleplayer

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

Firewatch
Shared: Atmospheric · Walking Simulator · Singleplayer

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Phasmophobia
Shared: Horror · Psychological Horror · Supernatural

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

DON'T SCREAM
Shared: Horror · Psychological Horror · Atmospheric

The Death | Thần Trùng
Shared: Horror · Psychological Horror · Casual

The Exit 8
Shared: Horror · Walking Simulator · Psychological Horror

Garten of Banban 2
Shared: Horror · Psychological Horror · Singleplayer

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

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

Summer of '58
Shared: Horror · Atmospheric · Psychological Horror

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

Resident Evil 7 Biohazard
Shared: Horror · Singleplayer · Atmospheric

Layers of Fear 2 (2019)
Shared: Horror · Psychological Horror · Atmospheric

Scanner Sombre
Shared: Horror · Walking Simulator · Atmospheric