Games like Sancta
Games like Sancta include Firewatch, What Remains of Edith Finch, The Exit 8, Five Nights at Freddy's: Secret of the Mimic, and Amnesia: A Machine For Pigs. We matched them by the tags players give Sancta on Steam (Adventure, Action-Adventure, Walking Simulator, Immersive Sim, and Exploration): 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 · Atmospheric

The Exit 8
Shared: Walking Simulator · Exploration · Immersive Sim

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

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

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

Scanner Sombre
Shared: Walking Simulator · Adventure · Exploration

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

SILENT HILL: Townfall
Shared: Adventure · Action-Adventure · Exploration

PEAK
Shared: Adventure · Exploration · First-Person

INFRA
Shared: Exploration · Adventure · Walking Simulator

Outer Wilds
Shared: Adventure · Exploration · Atmospheric

Lethal Company
Shared: First-Person · Exploration · Horror

The Cabin Factory
Shared: Walking Simulator · Immersive Sim · Adventure

The Vanishing of Ethan Carter
Shared: Walking Simulator · Adventure · Exploration

Millennium Dream
Shared: Adventure · Walking Simulator · Exploration

Platform 8
Shared: Adventure · Walking Simulator · Exploration

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

Amnesia: Rebirth
Shared: Action-Adventure · Adventure · First-Person

Dark Fracture: Prologue
Shared: Adventure · Exploration · First-Person

The Park®
Shared: Walking Simulator · Adventure · First-Person

The Long Dark
Shared: Exploration · Adventure · Atmospheric

Kiosk
Shared: Immersive Sim · Action-Adventure · Horror

The Forest
Shared: Adventure · Horror · First-Person