Games like project_Structure_01
Games like project_Structure_01 include Firewatch, What Remains of Edith Finch, Antichamber, NaissanceE, and The Beginner's Guide. We matched them by the tags players give project_Structure_01 on Steam (Atmospheric, Adventure, First-Person, Exploration, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Atmospheric · Adventure · Walking Simulator

What Remains of Edith Finch
Shared: Atmospheric · First-Person · Walking Simulator

Antichamber
Shared: First-Person · Exploration · Surreal

NaissanceE
Shared: Atmospheric · Exploration · First-Person

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

The Witness
Shared: First-Person · Exploration · Atmospheric

The Long Dark
Shared: Atmospheric · Exploration · First-Person

POOLS
Shared: Atmospheric · Walking Simulator · Exploration

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Gone Home
Shared: Atmospheric · Walking Simulator · Exploration

Journey
Shared: Atmospheric · Adventure · Exploration

Obduction
Shared: Adventure · Exploration · First-Person

Moncage
Shared: Adventure · Atmospheric · Casual

The Unfinished Swan
Shared: Adventure · Exploration · First-Person

Riven
Shared: Adventure · First-Person · Exploration

Kairo
Shared: Atmospheric · Exploration · First-Person

Layers of Fear (2016)
Shared: Atmospheric · First-Person · Walking Simulator

Scanner Sombre
Shared: Atmospheric · Exploration · Adventure

Quern - Undying Thoughts
Shared: Adventure · Atmospheric · Exploration

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

Fallout 4
Shared: Exploration · Adventure · Atmospheric

Valley
Shared: Adventure · First-Person · Exploration

INFRA
Shared: Atmospheric · Exploration · First-Person

Slime Rancher
Shared: Adventure · Exploration · First-Person