Games like NINJA KAMUI: SHINOBI ORIGINS
Games like NINJA KAMUI: SHINOBI ORIGINS include Anomaly Agent, Nitro Express, Momodora: Reverie Under The Moonlight, Your Only Move Is HUSTLE, and Super Time Force Ultra. We matched them by the tags players give NINJA KAMUI: SHINOBI ORIGINS on Steam (Side Scroller, Spectacle fighter, 2D Platformer, Bullet Hell, and Runner): closest matches first, and among equally close ones the better-known games.

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

Nitro Express
Shared: Side Scroller · 2D Platformer · Runner

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · 2D Platformer · Spectacle fighter

Your Only Move Is HUSTLE
Shared: Spectacle fighter · 2D Fighter · Side Scroller

Super Time Force Ultra
Shared: Side Scroller · 2D Platformer · Bullet Hell

Brawlhalla
Shared: 2D Platformer · 2D Fighter · Platformer

MARVEL Tōkon: Fighting Souls
Shared: Spectacle fighter · 2D Fighter · Action

Touhou Hero of Ice Fairy
Shared: Side Scroller · Bullet Hell · Platformer

SHINOBI: Art of Vengeance
Shared: 2D Platformer · Platformer · Side Scroller

Contra: Operation Galuga
Shared: 2D Platformer · Side Scroller · Platformer

Touhou Luna Nights
Shared: Side Scroller · Bullet Hell · Platformer

Soda Crisis
Shared: Side Scroller · Runner · Platformer

ICEY
Shared: Side Scroller · Action · Spectacle fighter

NINJA GAIDEN: Ragebound
Shared: 2D Platformer · Side Scroller · Platformer

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

Warhammer 40,000: Shootas, Blood & Teef
Shared: Side Scroller · 2D Platformer · Bullet Hell

STRIDER
Shared: Side Scroller · Platformer · Action

Terminator 2D: NO FATE
Shared: Side Scroller · 2D Platformer · Arcade

Rise & Shine
Shared: Side Scroller · 2D Platformer · Bullet Hell

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

Afterimage
Shared: 2D Platformer · Side Scroller · Platformer

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

Serious Sam: Kamikaze Attack!
Shared: Side Scroller · 2D Platformer · Runner

Mighty No. 9
Shared: Side Scroller · Platformer · Action