Games like Scanner Sombre
Games like Scanner Sombre include Firewatch, What Remains of Edith Finch, Layers of Fear (2016), Amnesia: A Machine For Pigs, and The Exit 8. We matched them by the tags players give Scanner Sombre on Steam (Exploration, Walking Simulator, Horror, Atmospheric, and Adventure): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Walking Simulator · Atmospheric · Adventure

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

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

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

The Exit 8
Shared: Exploration · Walking Simulator · Horror

SOMA
Shared: Horror · Atmospheric · Psychological Horror

Lethal Company
Shared: Horror · Exploration · First-Person

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

Outlast
Shared: Horror · Atmospheric · First-Person

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

Inside the Backrooms
Shared: Horror · Exploration · Psychological Horror

BABBDI
Shared: Exploration · Walking Simulator · Atmospheric

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

INFRA
Shared: Exploration · Atmospheric · Walking Simulator

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

Poppy Playtime
Shared: Horror · First-Person · Psychological Horror

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

Killer Frequency
Shared: Horror · Adventure · Walking Simulator

MiSide
Shared: Horror · Psychological Horror · First-Person

Escape the Backrooms
Shared: Horror · Exploration · Psychological Horror

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

The Witness
Shared: Exploration · First-Person · Atmospheric

ROUTINE
Shared: Atmospheric · Psychological Horror · Horror

Stray
Shared: Atmospheric · Adventure · Exploration