Games like Somnara
Games like Somnara include Firewatch, The Beginner's Guide, What Remains of Edith Finch, NaissanceE, and Antichamber. We matched them by the tags players give Somnara on Steam (Adventure, Walking Simulator, Exploration, 3D, and Abstract): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

The Beginner's Guide
Shared: Walking Simulator · Adventure · First-Person

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

NaissanceE
Shared: Exploration · Walking Simulator · Adventure

Antichamber
Shared: Exploration · First-Person · Adventure

POOLS
Shared: Walking Simulator · Exploration · Atmospheric

Viewfinder
Shared: First-Person · Adventure · Abstract

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

The Long Dark
Shared: Exploration · Adventure · Atmospheric

Quern - Undying Thoughts
Shared: Adventure · Exploration · Walking Simulator

Fallout 4
Shared: Exploration · Adventure · Singleplayer

PEAK
Shared: Adventure · Exploration · First-Person

Riven
Shared: Adventure · Exploration · First-Person

The Witness
Shared: Exploration · First-Person · Walking Simulator

Scanner Sombre
Shared: Walking Simulator · Exploration · Adventure

Kairo
Shared: Exploration · Adventure · Abstract

The Exit 8
Shared: Exploration · Walking Simulator · 3D

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

Kona
Shared: Adventure · First-Person · Exploration

Valley
Shared: Adventure · Exploration · First-Person

Slime Rancher
Shared: Adventure · Exploration · First-Person

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

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

Stray
Shared: Adventure · Exploration · Atmospheric