Games like Yi and the Thousand Moons
Games like Yi and the Thousand Moons include Journey, GRIS, ABZU, Firewatch, and What Remains of Edith Finch. We matched them by the tags players give Yi and the Thousand Moons on Steam (Adventure, Indie, Music, Relaxing, and Walking Simulator): closest matches first, and among equally close ones the better-known games.

Journey
Shared: Adventure · Indie · Relaxing

GRIS
Shared: Indie · Adventure · Great Soundtrack

ABZU
Shared: Relaxing · Adventure · Great Soundtrack

Firewatch
Shared: Adventure · Walking Simulator · Atmospheric

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

Brothers - A Tale of Two Sons
Shared: Adventure · Indie · Atmospheric

AER Memories of Old
Shared: Adventure · Indie · Relaxing

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

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Adventure

The Last Campfire
Shared: Adventure · Indie · Relaxing

To the Moon
Shared: Indie · Great Soundtrack · Adventure

Mixtape
Shared: Music · Adventure · Walking Simulator

Florence
Shared: Indie · Adventure · Female Protagonist

A Short Hike
Shared: Adventure · Indie · Relaxing

The First Tree
Shared: Adventure · Indie · Walking Simulator

Mountain
Shared: Indie · Relaxing · Great Soundtrack

Neva
Shared: Adventure · Indie · Atmospheric

Slime Rancher 2
Shared: Relaxing · Adventure · Singleplayer

Assemble with Care
Shared: Indie · Relaxing · Female Protagonist

The Witcher 3: Wild Hunt — Remastered
Shared: Adventure · Atmospheric · Great Soundtrack

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

A Plague Tale: Innocence
Shared: Adventure · Female Protagonist · Atmospheric

Superbrothers: Sword & Sworcery EP
Shared: Adventure · Indie · Great Soundtrack

Hellblade: Senua's Sacrifice
Shared: Adventure · Female Protagonist · Atmospheric