Games like SnowTunes Island
Games like SnowTunes Island include Hollow Knight, Rain World, Neva, MIO: Memories in Orbit, and Hollow Knight: Silksong. We matched them by the tags players give SnowTunes Island on Steam (Platformer, Snow, Colorful, Exploration, and Atmospheric): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Exploration · Atmospheric

Rain World
Shared: Atmospheric · Exploration · Platformer

Neva
Shared: Platformer · Atmospheric · Colorful

MIO: Memories in Orbit
Shared: Platformer · Exploration · Atmospheric

Hollow Knight: Silksong
Shared: Platformer · Exploration · 2D

Ori and the Will of the Wisps
Shared: Platformer · Atmospheric · Exploration

Webbed
Shared: 2D Platformer · Platformer · Exploration

Geometry Dash
Shared: Platformer · Rhythm · Colorful

GRIS
Shared: Atmospheric · Platformer · Indie

Pizza Tower
Shared: Platformer · 2D Platformer · Indie

The Darkest Tales — Into the Nightmare
Shared: Platformer · Exploration · Colorful

ANIMAL WELL
Shared: Exploration · Platformer · Atmospheric

Öoo
Shared: Exploration · Platformer · 2D Platformer

Celeste
Shared: Platformer · 2D Platformer · Indie

SANABI
Shared: 2D Platformer · Platformer · Action

Prince of Persia The Lost Crown
Shared: Exploration · 2D Platformer · Colorful

Jusant
Shared: Exploration · Atmospheric · Platformer

ANTONBLAST
Shared: 2D Platformer · Exploration · 2D

A Dance of Fire and Ice
Shared: Rhythm · Colorful · 2D

Lone Fungus
Shared: Colorful · Platformer · 2D Platformer

Dust: An Elysian Tail
Shared: Platformer · Action · 2D

Pumpkin Jack
Shared: Colorful · Platformer · Atmospheric

Sonic Superstars
Shared: Platformer · 2D Platformer · Colorful

F.I.S.T.: Forged In Shadow Torch
Shared: Platformer · 2D Platformer · Exploration