Games like ArchWilio
Games like ArchWilio include Firewatch, Journey, Slime Rancher 2, The Last Campfire, and A Short Hike. We matched them by the tags players give ArchWilio on Steam (Adventure, Walking Simulator, 3D, Relaxing, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Singleplayer

Journey
Shared: Adventure · Relaxing · Indie

Slime Rancher 2
Shared: Relaxing · Singleplayer · Adventure

The Last Campfire
Shared: Adventure · Singleplayer · Indie

A Short Hike
Shared: Adventure · Relaxing · Indie

The First Tree
Shared: Adventure · Walking Simulator · Relaxing

GRIS
Shared: Adventure · Indie · Singleplayer

ABZU
Shared: Relaxing · Adventure · Singleplayer

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

The Stanley Parable
Shared: Walking Simulator · Indie · Adventure

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

Monument Valley
Shared: Adventure · Relaxing · Singleplayer

Copycat
Shared: Adventure · Indie · Singleplayer

POOLS
Shared: Walking Simulator · Singleplayer · Adventure

Mixtape
Shared: Walking Simulator · Adventure · Singleplayer

AER Memories of Old
Shared: Adventure · Relaxing · Indie

Kona
Shared: Adventure · Singleplayer · Walking Simulator

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

DAVE THE DIVER
Shared: Adventure · Relaxing · Singleplayer

Book of Travels
Shared: Walking Simulator · Relaxing · Singleplayer

Scanner Sombre
Shared: Walking Simulator · Adventure · Indie

Tiny Terry's Turbo Trip
Shared: Adventure · 3D · Indie

Chants of Sennaar
Shared: Adventure · Singleplayer · Indie

Cairn
Shared: Adventure · Indie · Singleplayer