Games like ULTRA NINJA SOUL
Games like ULTRA NINJA SOUL include SANABI, The Messenger, NINJA GAIDEN: Ragebound, Katana ZERO, and Broforce. We matched them by the tags players give ULTRA NINJA SOUL on Steam (Action, Side Scroller, 2D Platformer, Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Pixel Graphics · 2D Platformer

The Messenger
Shared: Platformer · Retro · Pixel Graphics

NINJA GAIDEN: Ragebound
Shared: Action · 2D Platformer · Platformer

Katana ZERO
Shared: Action · Pixel Graphics · Platformer

Broforce
Shared: Action · Pixel Graphics · 2D

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

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

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · 2D

Gravity Circuit
Shared: Action · Platformer · 2D

Celeste
Shared: Pixel Graphics · Platformer · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Bloodstained: Curse of the Moon
Shared: Action · Platformer · Pixel Graphics

Mark of the Ninja
Shared: Platformer · Action · 2D

Mark of the Ninja: Remastered
Shared: Action · 2D · Side Scroller

Sonic Mania
Shared: Platformer · 2D · Pixel Graphics

SHINOBI: Art of Vengeance
Shared: Action · 2D Platformer · Platformer

VVVVVV
Shared: Platformer · Pixel Graphics · 2D Platformer

Rogue Legacy
Shared: Platformer · Action · 2D

Cyber Shadow
Shared: Ninja · Platformer · 2D

Gato Roboto
Shared: Action · Pixel Graphics · 2D

Azure Striker Gunvolt
Shared: Action · Platformer · Side Scroller

Sonic Origins
Shared: Action · 2D Platformer · Platformer

Axiom Verge
Shared: Action · Platformer · Pixel Graphics

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