Games like Ninja Soul
Games like Ninja Soul include Dead Cells, Skul: The Hero Slayer, Hades, Hades II, and Vampire Survivors. We matched them by the tags players give Ninja Soul on Steam (Action Roguelike, Hack and Slash, Action, Roguelite, and Platformer): closest matches first, and among equally close ones the better-known games.

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Indie

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

Hades II
Shared: Action · Hack and Slash · Roguelite

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

Rogue Legacy
Shared: Action Roguelike · Platformer · Action

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Roguelike

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · Platformer

Risk of Rain (2013)
Shared: Action Roguelike · Action · Platformer

Dungreed
Shared: Action Roguelike · Roguelite · Action

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

Death Must Die
Shared: Action Roguelike · Roguelite · Hack and Slash

The Binding of Isaac
Shared: Action Roguelike · Indie · Roguelike

ScourgeBringer
Shared: Action · Action Roguelike · Roguelite

Moonlighter
Shared: Hack and Slash · Roguelite · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Cinderia
Shared: Action Roguelike · Hack and Slash · Roguelite

Hero Siege
Shared: Hack and Slash · Action Roguelike · Pixel Graphics

Spelunky
Shared: Action Roguelike · Platformer · Roguelike

Children of Morta
Shared: Hack and Slash · Action Roguelike · Roguelike

Wizard of Legend
Shared: Action Roguelike · Action · Roguelike

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

UnderMine
Shared: Action Roguelike · Roguelite · Action

Heroes of Hammerwatch II
Shared: Action Roguelike · Action · Roguelite