Games like Umbra Halloween
Games like Umbra Halloween include MiSide, Mouthwashing, Layers of Fear (2016), The Exit 8, and SOMA. We matched them by the tags players give Umbra Halloween on Steam (Surreal, Psychological Horror, Horror, Atmospheric, and Puzzle): closest matches first, and among equally close ones the better-known games.

MiSide
Shared: Psychological Horror · Horror · Atmospheric

Mouthwashing
Shared: Psychological Horror · Horror · Atmospheric

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

The Exit 8
Shared: Horror · Puzzle · Psychological Horror

SOMA
Shared: Psychological Horror · Horror · Atmospheric

Garten of Banban
Shared: Horror · Psychological Horror · Puzzle

The Beginner's Guide
Shared: Atmospheric · Walking Simulator · Surreal

Detention
Shared: Horror · Psychological Horror · Atmospheric

Fran Bow
Shared: Psychological Horror · Horror · Puzzle

What Remains of Edith Finch
Shared: Atmospheric · Walking Simulator · Story Rich

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

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

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

Poppy Playtime
Shared: Horror · Puzzle · Psychological Horror

Inside the Backrooms
Shared: Horror · Psychological Horror · Puzzle

Scorn
Shared: Horror · Atmospheric · Puzzle

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

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

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

Outlast
Shared: Horror · Psychological Horror · Atmospheric

POOLS
Shared: Psychological Horror · Atmospheric · Walking Simulator

Backrooms: Escape Together
Shared: Horror · Psychological Horror · Atmospheric

Scanner Sombre
Shared: Horror · Atmospheric · Walking Simulator

Firewatch
Shared: Atmospheric · Walking Simulator · Story Rich