Games like Killjoy Hunter Yuuko
Games like Killjoy Hunter Yuuko include Muse Dash, ICEY, Ori and the Will of the Wisps, Freedom Planet, and Hollow Knight: Silksong. We matched them by the tags players give Killjoy Hunter Yuuko on Steam (Action, Platformer, Anime, Female Protagonist, and 2D): closest matches first, and among equally close ones the better-known games.

Muse Dash
Shared: Anime · Female Protagonist · Cute

ICEY
Shared: Action · Anime · Female Protagonist

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

Freedom Planet
Shared: Platformer · Action · Female Protagonist

Hollow Knight: Silksong
Shared: Platformer · 2D · Great Soundtrack

Bloodstained: Ritual of the Night
Shared: Action · Female Protagonist · Anime

Hollow Knight
Shared: Platformer · 2D · Great Soundtrack

Celeste
Shared: Platformer · Female Protagonist · Great Soundtrack

ENDER MAGNOLIA: Bloom in the Mist
Shared: Female Protagonist · 2D · Singleplayer

Shantae and the Pirate's Curse
Shared: Platformer · Female Protagonist · Action

Shantae: Half-Genie Hero
Shared: Platformer · Female Protagonist · Action

Momodora III
Shared: Action · Platformer · Female Protagonist

Shantae: Risky's Revenge - Director's Cut
Shared: Platformer · Female Protagonist · Action

Shantae and the Seven Sirens
Shared: Platformer · Female Protagonist · Anime

Touhou Hero of Ice Fairy
Shared: Anime · Female Protagonist · Platformer

Planet of Lana
Shared: Action · Female Protagonist · Platformer

Lost Ruins
Shared: Anime · Action · Platformer

Katana ZERO
Shared: Action · Platformer · Great Soundtrack

NieR:Automata™
Shared: Action · Female Protagonist · Great Soundtrack

The Vagrant
Shared: Action · Female Protagonist · 2D

Indivisible
Shared: Action · Platformer · Female Protagonist

Hatsune Miku: Project DIVA Mega Mix+
Shared: Anime · Action · Cute

Portal 2
Shared: Platformer · Singleplayer · Female Protagonist

BlazBlue Entropy Effect
Shared: Action · Platformer · 2D

