Games like Soul Valley
Games like Soul Valley include Firewatch, What Remains of Edith Finch, Outer Wilds, The Long Dark, and Return of the Obra Dinn. We matched them by the tags players give Soul Valley on Steam (Adventure, Indie, Survival, Walking Simulator, and Mystery): 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 · Mystery

Outer Wilds
Shared: Adventure · Exploration · Mystery

The Long Dark
Shared: Survival · Adventure · Exploration

Return of the Obra Dinn
Shared: Mystery · Indie · Atmospheric

INFRA
Shared: Adventure · Exploration · Walking Simulator

Gone Home
Shared: Indie · Walking Simulator · Exploration

Journey
Shared: Adventure · Indie · Atmospheric

The Witness
Shared: Exploration · Indie · Singleplayer

The Beginner's Guide
Shared: Indie · Walking Simulator · Adventure

Blue Prince
Shared: Mystery · Exploration · Indie

OneShot
Shared: Indie · Story Rich · Adventure

FAR: Lone Sails
Shared: Adventure · Atmospheric · Indie

Cairn
Shared: Indie · Adventure · Exploration

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

Chants of Sennaar
Shared: Adventure · Indie · Singleplayer

The Talos Principle
Shared: Atmospheric · Adventure · Puzzle

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

Obduction
Shared: Adventure · Indie · Exploration

Deliver Us The Moon
Shared: Adventure · Indie · Atmospheric

GRIS
Shared: Indie · Adventure · Atmospheric

Stray
Shared: Adventure · Atmospheric · Exploration

Everybody's Gone to the Rapture
Shared: Indie · Walking Simulator · Adventure

Fallout 4
Shared: Adventure · Exploration · Singleplayer