Games like Seroutte
Games like Seroutte include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), POOLS, and Scanner Sombre. We matched them by the tags players give Seroutte on Steam (Adventure, Walking Simulator, Exploration, 3D, and First-Person): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Exploration

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

POOLS
Shared: Walking Simulator · Exploration · Atmospheric

Scanner Sombre
Shared: Walking Simulator · Exploration · Adventure

The Exit 8
Shared: Exploration · Walking Simulator · First-Person

Outlast
Shared: First-Person · Atmospheric · Horror

SOMA
Shared: Atmospheric · Exploration · Horror

Still Wakes the Deep
Shared: Walking Simulator · First-Person · Adventure

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

PEAK
Shared: Adventure · Exploration · First-Person

Visage
Shared: Adventure · First-Person · Dark

ROUTINE
Shared: Adventure · Atmospheric · Dark

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

Bad Parenting 1: Mr. Red Face
Shared: Adventure · Walking Simulator · 3D

Dreamcore
Shared: Walking Simulator · Exploration · First-Person

Iron Lung
Shared: Atmospheric · Horror · Adventure

Gone Home
Shared: Walking Simulator · Exploration · First-Person

Among the Sleep - Enhanced Edition
Shared: Adventure · Walking Simulator · First-Person

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

CARIMARA: Beneath the forlorn limbs
Shared: Adventure · Exploration · 3D

Lethal Company
Shared: First-Person · Exploration · Horror

Psalm 5:9-13
Shared: Exploration · Walking Simulator · Horror

Five Nights at Freddy's: Security Breach
Shared: First-Person · Exploration · Adventure