Games like Lone Fungus
Games like Lone Fungus include Celeste, SANABI, Rain World, Momodora: Reverie Under The Moonlight, and Super Meat Boy. We matched them by the tags players give Lone Fungus on Steam (Pixel Graphics, Adventure, 2D Platformer, Colorful, and Action): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Pixel Graphics · Precision Platformer · 2D Platformer

SANABI
Shared: Pixel Graphics · 2D Platformer · Action

Rain World
Shared: Pixel Graphics · Atmospheric · Platformer

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Pixel Graphics · Side Scroller

Super Meat Boy
Shared: Pixel Graphics · 2D Platformer · Platformer

VVVVVV
Shared: Pixel Graphics · 2D Platformer · Platformer

Webbed
Shared: Pixel Graphics · 2D Platformer · Platformer

Prince of Persia The Lost Crown
Shared: 2D Platformer · Adventure · Action

Shovel Knight: Treasure Trove
Shared: Pixel Graphics · Platformer · Adventure

Haiku, the Robot
Shared: Adventure · Pixel Graphics · 2D Platformer

Sonic Mania
Shared: Pixel Graphics · Platformer · Adventure

Sonic Origins
Shared: Adventure · 2D Platformer · Pixel Graphics

Jump King
Shared: Pixel Graphics · Adventure · Precision Platformer

Hyper Light Drifter
Shared: Pixel Graphics · Adventure · Atmospheric

Hollow Knight
Shared: Platformer · Adventure · Exploration

Gato Roboto
Shared: Pixel Graphics · Adventure · Action

Katana ZERO
Shared: Pixel Graphics · Action · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Platformer

Axiom Verge
Shared: Pixel Graphics · Platformer · Action

Downwell
Shared: Pixel Graphics · Precision Platformer · 2D Platformer

Ori and the Will of the Wisps
Shared: Platformer · Adventure · Action

ANIMAL WELL
Shared: Pixel Graphics · Exploration · Platformer

Broforce
Shared: Pixel Graphics · Action · Platformer

Owlboy
Shared: Pixel Graphics · Adventure · Platformer