Games like Year Unknown
Games like Year Unknown include Firewatch, The Talos Principle, What Remains of Edith Finch, Outer Wilds, and The Talos Principle 2. We matched them by the tags players give Year Unknown on Steam (Exploration, Sci-fi, Walking Simulator, Philosophical, and Adventure): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Exploration

The Talos Principle
Shared: Sci-fi · Philosophical · Exploration

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

Outer Wilds
Shared: Exploration · Adventure · Sci-fi

The Talos Principle 2
Shared: Philosophical · Sci-fi · Exploration

Gone Home
Shared: Walking Simulator · Exploration · Indie

Fallout 4
Shared: Exploration · Adventure · Sci-fi

Cairn
Shared: Exploration · Stylized · Adventure

Valley
Shared: Exploration · Adventure · First-Person

KARMA: The Dark World
Shared: Walking Simulator · Sci-fi · Philosophical

SOMA
Shared: Sci-fi · Exploration · Atmospheric

Journey
Shared: Exploration · Adventure · Walking Simulator

No Man's Sky
Shared: Exploration · Sci-fi · Adventure

Event[0]
Shared: Exploration · Sci-fi · Interactive Fiction

DEATH STRANDING DIRECTOR'S CUT
Shared: Walking Simulator · Exploration · Adventure

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

Amnesia: A Machine For Pigs
Shared: Walking Simulator · Exploration · Interactive Fiction

Tacoma
Shared: Walking Simulator · Sci-fi · Adventure

The Stanley Parable
Shared: Walking Simulator · Exploration · Adventure

Before Your Eyes
Shared: Walking Simulator · Interactive Fiction · Adventure

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

ROUTINE
Shared: Sci-fi · Adventure · Exploration

Scanner Sombre
Shared: Exploration · Walking Simulator · Adventure

COCOON
Shared: Exploration · Adventure · Stylized