Games like Touhou Yukkuri Mountain
Games like Touhou Yukkuri Mountain include Portal, Donut County, hololive Treasure Mountain, Zup! S, and Portal 2. We matched them by the tags players give Touhou Yukkuri Mountain on Steam (Casual, 3D Platformer, Puzzle, 3D, and Comedy): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle · 3D Platformer · Comedy

Donut County
Shared: Casual · Puzzle · Physics

hololive Treasure Mountain
Shared: Casual · Puzzle · 3D Platformer

Zup! S
Shared: Casual · Puzzle · Physics

Portal 2
Shared: Puzzle · Singleplayer · 3D Platformer

Zup!
Shared: Casual · Puzzle · Physics

Peggle Deluxe
Shared: Casual · Puzzle · Singleplayer

Assemble with Care
Shared: Casual · Puzzle · Short

Mirror 2: Project X
Shared: 3D · Anime · Casual

Zup! X
Shared: Casual · Puzzle · Physics

Zup! F
Shared: Casual · Puzzle · Physics

Quantum Conundrum
Shared: 3D Platformer · Puzzle · Casual

Zup! 2
Shared: Casual · Puzzle · Physics

World of Goo
Shared: Puzzle · Casual · Physics

Hozy
Shared: Casual · Puzzle · Physics

Zup! 3
Shared: Casual · Puzzle · Physics

Little Inferno
Shared: Casual · Puzzle · Singleplayer

Is This Seat Taken?
Shared: Casual · Puzzle · Cute

Placid Plastic Duck Simulator
Shared: Casual · 3D · Physics

Fruit Mountain
Shared: Casual · Puzzle · Physics

Garry's Mod
Shared: Casual · Physics · Singleplayer

Zup! 8
Shared: Casual · Puzzle · Physics

Puyo Puyo™ Tetris® 2
Shared: Casual · Puzzle · Cute

Sizeable
Shared: Casual · Puzzle · 3D