Games like Super Komio Island
Games like Super Komio Island include Momodora: Reverie Under The Moonlight, Webbed, Celeste, Pizza Tower, and 20XX. We matched them by the tags players give Super Komio Island on Steam (Side Scroller, 2D Platformer, Platformer, Female Protagonist, and 2D): closest matches first, and among equally close ones the better-known games.

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Side Scroller · Female Protagonist

Webbed
Shared: 2D Platformer · Cute · Platformer

Celeste
Shared: Platformer · 2D Platformer · Female Protagonist

Pizza Tower
Shared: 2D Platformer · Platformer · Cartoony

20XX
Shared: Platformer · 2D Platformer · Action

Planet of Lana
Shared: Female Protagonist · 2D Platformer · Action

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Platformer

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

Afterimage
Shared: 2D Platformer · Female Protagonist · Side Scroller

30XX
Shared: 2D Platformer · Side Scroller · Platformer

Gal Guardians: Demon Purge
Shared: 2D Platformer · Side Scroller · Platformer

SANABI
Shared: 2D Platformer · Action · 2D

ICEY
Shared: Female Protagonist · Side Scroller · Action

Gravity Circuit
Shared: Platformer · 2D Platformer · Action

Grapple Dog
Shared: 2D Platformer · Platformer · 2D

Thomas Was Alone
Shared: Side Scroller · Platformer · 2D Platformer

Touhou Hero of Ice Fairy
Shared: Side Scroller · Female Protagonist · Platformer

Freedom Planet
Shared: Platformer · Female Protagonist · 2D

Shantae: Half-Genie Hero
Shared: Platformer · Female Protagonist · Side Scroller

Castlevania: Belmont's Curse
Shared: 2D Platformer · Female Protagonist · Platformer

Mina the Hollower
Shared: 2D Platformer · Female Protagonist · Platformer

Gato Roboto
Shared: 2D · Platformer · Action

Pepper Grinder
Shared: 2D Platformer · Platformer · Female Protagonist

Sonic Mania
Shared: Platformer · 2D · Side Scroller