Games like Arcadian Days
Games like Arcadian Days include Big Walk, The Witness, Slime Rancher, Outer Wilds, and TOEM: A Photo Adventure. We matched them by the tags players give Arcadian Days on Steam (Exploration, Sandbox, Puzzle, 3D, and First-Person): closest matches first, and among equally close ones the better-known games.

Big Walk
Shared: Exploration · Puzzle · Relaxing

The Witness
Shared: Exploration · Puzzle · First-Person

Slime Rancher
Shared: Exploration · First-Person · Sandbox

Outer Wilds
Shared: Exploration · Puzzle · Story Rich

TOEM: A Photo Adventure
Shared: Puzzle · Exploration · Cozy

Fallout 4
Shared: Exploration · Open World · First-Person

Blue Prince
Shared: Exploration · Puzzle · First-Person

Creature Kitchen
Shared: Puzzle · Cozy · First-Person

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

Antichamber
Shared: Puzzle · Exploration · First-Person

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

Little Kitty, Big City
Shared: Exploration · Sandbox · Cozy

Riven
Shared: Exploration · Puzzle · First-Person

Eastshade
Shared: Exploration · First-Person · Relaxing

Indiana Jones and the Great Circle
Shared: Puzzle · First-Person · Exploration

Firewatch
Shared: Exploration · First-Person · Story Rich

Black Desert
Shared: Sandbox · Exploration · First-Person

Islands of Insight
Shared: Puzzle · Exploration · Nonlinear

PowerWash Simulator
Shared: Relaxing · Sandbox · First-Person

The Talos Principle
Shared: Puzzle · First-Person · Exploration

The Exit 8
Shared: Exploration · Puzzle · First-Person

Internet Cafe Simulator 2
Shared: Exploration · 3D · Sandbox

Quern - Undying Thoughts
Shared: Puzzle · Exploration · First-Person

Hozy
Shared: Sandbox · Puzzle · Cozy