Games like NecroKitty
Games like NecroKitty include Anomaly Agent, Katana ZERO, Brawlhalla, SHINOBI: Art of Vengeance, and ICEY. We matched them by the tags players give NecroKitty on Steam (Side Scroller, Action, 2D Platformer, Casual, and Hack and Slash): closest matches first, and among equally close ones the better-known games.

Anomaly Agent
Shared: Side Scroller · 2D Platformer · Hack and Slash

Katana ZERO
Shared: Action · 2D Platformer · Platformer

Brawlhalla
Shared: 2D Platformer · Casual · Action

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

ICEY
Shared: Action · Side Scroller · Hack and Slash

Eastern Exorcist
Shared: Action · Side Scroller · Hack and Slash

Have a Nice Death
Shared: Hack and Slash · Action · 2D Platformer

Skul: The Hero Slayer
Shared: Action · Side Scroller · 2D

SANABI
Shared: Action · 2D Platformer · 2D

Pizza Tower
Shared: 2D Platformer · Action · Platformer

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

Broforce
Shared: Action · Side Scroller · 2D

Oozi: Earth Adventure
Shared: 2D Platformer · Casual · Action

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

Mark of the Ninja
Shared: Action · Side Scroller · Platformer

Gravity Circuit
Shared: Action · 2D Platformer · Platformer

Super Meat Boy Forever
Shared: Action · Runner · Side Scroller

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

20XX
Shared: Action · 2D Platformer · Platformer

Bladed fury
Shared: Action · Side Scroller · Hack and Slash

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

Dust: An Elysian Tail
Shared: Action · Platformer · 2D

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

Shank
Shared: Action · Side Scroller · 2D