Games like Fu-Fu-Chan -way up!-
Games like Fu-Fu-Chan -way up!- include Pizza Tower, SANABI, Melatonin, Celeste, and Webbed. We matched them by the tags players give Fu-Fu-Chan -way up!- on Steam (Action, 2D Platformer, Singleplayer, Cute, and Colorful): closest matches first, and among equally close ones the better-known games.

Pizza Tower
Shared: 2D Platformer · Indie · Singleplayer

SANABI
Shared: Action · 2D Platformer · Singleplayer

Melatonin
Shared: Cute · Indie · Colorful

Celeste
Shared: 2D Platformer · Indie · Singleplayer

Webbed
Shared: 2D Platformer · Cute · 2D

Skul: The Hero Slayer
Shared: Action · Indie · Singleplayer

Katana ZERO
Shared: Action · 2D Platformer · Indie

Muse Dash
Shared: Cute · Singleplayer · 2D

ANTONBLAST
Shared: 2D Platformer · Action · Singleplayer

Slime Rancher
Shared: Cute · Singleplayer · Colorful

A Dance of Fire and Ice
Shared: Singleplayer · 2D · Indie

Super Meat Boy
Shared: 2D Platformer · Indie · Singleplayer

Slime Rancher 2
Shared: Cute · Singleplayer · Colorful

Gravity Circuit
Shared: Action · Singleplayer · 2D Platformer

Geometry Dash
Shared: 2D · Singleplayer · Colorful

Planet of Lana
Shared: Action · 2D Platformer · Singleplayer

Cat Goes Fishing
Shared: Cute · 2D · Singleplayer

Monster Boy and the Cursed Kingdom
Shared: Action · Singleplayer · Indie

Have a Nice Death
Shared: Singleplayer · Action · 2D

Bastion
Shared: Action · Singleplayer · Indie

Ori and the Will of the Wisps
Shared: Action · Singleplayer · Cute

Hollow Knight
Shared: Singleplayer · 2D · Indie

Gensokyo Night Festival
Shared: Action · Indie · Cute

Sonic Superstars
Shared: Action · 2D Platformer · 2D