Games like Fiz and the Rainbow Planet
Games like Fiz and the Rainbow Planet include SANABI, Shovel Knight: Treasure Trove, Skul: The Hero Slayer, Celeste, and Gato Roboto. We matched them by the tags players give Fiz and the Rainbow Planet on Steam (Action, Side Scroller, Pixel Graphics, 2.5D, and Cute): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Pixel Graphics · Adventure

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

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · Side Scroller

Celeste
Shared: Pixel Graphics · Platformer · Singleplayer

Gato Roboto
Shared: Action · Pixel Graphics · Adventure

Bloodstained: Curse of the Moon
Shared: Action · Pixel Graphics · Side Scroller

Spyro™ Reignited Trilogy
Shared: Action · Adventure · Dragons

Broforce
Shared: Action · Pixel Graphics · Side Scroller

Klonoa Phantasy Reverie Series
Shared: Side Scroller · 2.5D · Adventure

Sonic Origins
Shared: Action · Pixel Graphics · Adventure

NINJA GAIDEN: Ragebound
Shared: Action · Pixel Graphics · Side Scroller

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

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

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

MO:Astray
Shared: Action · Pixel Graphics · Adventure

Gravity Circuit
Shared: Action · Pixel Graphics · Platformer

The Messenger
Shared: Pixel Graphics · Action · Platformer

Gal Guardians: Demon Purge
Shared: Action · Side Scroller · Adventure

Sonic Mania
Shared: Pixel Graphics · Action · Platformer

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

Bloodstained: Ritual of the Night
Shared: Action · Side Scroller · Adventure

REPLACED
Shared: Pixel Graphics · Side Scroller · 2.5D

Deadlight
Shared: Action · Side Scroller · Platformer

Shantae: Half-Genie Hero
Shared: Action · Side Scroller · Cute