Games like Within the Backrooms
Games like Within the Backrooms include Firewatch, Fallout 4, Cairn, The Long Dark, and Outer Wilds. We matched them by the tags players give Within the Backrooms on Steam (Adventure, Exploration, Atmospheric, Retro, and Surreal): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Atmospheric · Exploration

Fallout 4
Shared: Exploration · Adventure · Open World

Cairn
Shared: Exploration · Adventure · Stylized

The Long Dark
Shared: Exploration · Atmospheric · Adventure

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

The Witness
Shared: Exploration · Atmospheric · Open World

Journey
Shared: Adventure · Atmospheric · Exploration

BABBDI
Shared: Exploration · Atmospheric · Surreal

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: Atmospheric · Open World · Exploration

Stray
Shared: Adventure · Atmospheric · Exploration

DREDGE
Shared: Exploration · Adventure · Atmospheric

Sable
Shared: Exploration · Atmospheric · Adventure

Broken Reality
Shared: Adventure · Retro · Surreal

Slime Rancher
Shared: Exploration · Adventure · Open World

Fatum Betula
Shared: Adventure · Retro · Atmospheric

COCOON
Shared: Adventure · Exploration · Atmospheric

No Man's Sky
Shared: Exploration · Open World · Adventure

Antichamber
Shared: Exploration · Surreal · Adventure

The Witcher 3: Wild Hunt — Remastered
Shared: Atmospheric · Adventure · Open World

Obduction
Shared: Adventure · Exploration · Surreal

Endacopia
Shared: Adventure · Surreal · Exploration

Road 96
Shared: Adventure · Atmospheric · 1990's

Big Walk
Shared: Exploration · Adventure · Open World

Hypnagogia² 無限の夢 Boundless Dreams
Shared: Adventure · Exploration · Surreal