Games like Abandoned Souls
Games like Abandoned Souls include SOMA, Outlast, Poppy Playtime, What Remains of Edith Finch, and Firewatch. We matched them by the tags players give Abandoned Souls on Steam (Walking Simulator, Horror, Psychological Horror, Atmospheric, and Realistic): closest matches first, and among equally close ones the better-known games.

SOMA
Shared: Horror · Psychological Horror · Atmospheric

Outlast
Shared: Horror · Atmospheric · Psychological Horror

Poppy Playtime
Shared: Horror · Psychological Horror · Survival Horror

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

Firewatch
Shared: Walking Simulator · Atmospheric · First-Person

Visage
Shared: Horror · Psychological Horror · Survival Horror

Layers of Fear (2016)
Shared: Horror · Psychological Horror · Walking Simulator

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

Outlast 2
Shared: Horror · Psychological Horror · Survival Horror

Mouthwashing
Shared: Horror · Psychological Horror · Atmospheric

Lethal Company
Shared: Horror · First-Person · Survival Horror

Slender: The Arrival
Shared: Horror · Survival Horror · Psychological Horror

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

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

Darkwood
Shared: Horror · Psychological Horror · Survival Horror

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

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

Resident Evil Village
Shared: Horror · Survival Horror · First-Person

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

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

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

SILENT HILL 2
Shared: Horror · Psychological Horror · Atmospheric

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

Five Nights at Freddy's: Security Breach
Shared: Horror · Survival Horror · First-Person