Games like Selling Souls
Games like Selling Souls include Firewatch, Five Nights at Freddy's: Security Breach, Escape the Backrooms, What Remains of Edith Finch, and The Exit 8. We matched them by the tags players give Selling Souls on Steam (Adventure, Horror, First-Person, Indie, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · First-Person

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

Escape the Backrooms
Shared: Horror · First-Person · Adventure

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

The Exit 8
Shared: Horror · Exploration · Walking Simulator

Layers of Fear (2016)
Shared: Horror · First-Person · Walking Simulator

Scanner Sombre
Shared: Horror · Adventure · Walking Simulator

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

The Forest
Shared: Horror · Adventure · First-Person

Kona
Shared: Adventure · First-Person · Singleplayer

PEAK
Shared: Adventure · First-Person · Exploration

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

Valley
Shared: Adventure · First-Person · Exploration

The Stanley Parable
Shared: Indie · First-Person · Walking Simulator

Lethal Company
Shared: Horror · First-Person · Exploration

Amnesia: A Machine For Pigs
Shared: Horror · Walking Simulator · First-Person

Poppy Playtime
Shared: Horror · First-Person · Singleplayer

Subnautica
Shared: Horror · Exploration · Adventure

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

Outlast
Shared: Horror · First-Person · Adventure

Slime Rancher
Shared: Adventure · Exploration · First-Person

Blair Witch
Shared: Adventure · Horror · Indie

NaissanceE
Shared: Indie · Exploration · Adventure

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