Games like Putridum Horror
Games like Putridum Horror include Outlast, Layers of Fear (2016), MiSide, Firewatch, and What Remains of Edith Finch. We matched them by the tags players give Putridum Horror on Steam (Indie, Atmospheric, Horror, Psychological Horror, and First-Person): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Atmospheric · First-Person

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

MiSide
Shared: Psychological Horror · Horror · First-Person

Firewatch
Shared: Atmospheric · Adventure · First-Person

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Walking Simulator

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Visage
Shared: Horror · Psychological Horror · Atmospheric

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Blair Witch
Shared: Horror · Indie · Psychological Horror

Welcome to Kowloon
Shared: Atmospheric · Horror · Psychological Horror

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

Little Nightmares
Shared: Atmospheric · Horror · Adventure

From The Darkness
Shared: Horror · Indie · Psychological Horror

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Slender: The Arrival
Shared: Horror · Indie · First-Person

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

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

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

Still Wakes the Deep
Shared: Horror · Psychological Horror · First-Person

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

The Beast Inside
Shared: Horror · First-Person · Adventure

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

Scanner Sombre
Shared: Horror · Atmospheric · Walking Simulator

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