Games like Katana Killer
Games like Katana Killer include Vampire Survivors, BALL x PIT, Skul: The Hero Slayer, BlazBlue Entropy Effect, and Katana ZERO. We matched them by the tags players give Katana Killer on Steam (Action, Action Roguelike, Arcade, Top-Down Shooter, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Pixel Graphics · 2D

BALL x PIT
Shared: Action · Arcade · Action Roguelike

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Pixel Graphics

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · 2D

Katana ZERO
Shared: Action · Pixel Graphics · Cyberpunk

SANABI
Shared: Action · Pixel Graphics · Cyberpunk

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

Rogue Legacy
Shared: Action Roguelike · Action · 2D

Nuclear Throne
Shared: Action Roguelike · Action · Pixel Graphics

Halls of Torment
Shared: Action Roguelike · Action · Pixel Graphics

Megabonk
Shared: Action Roguelike · Action · Indie

Downwell
Shared: Action Roguelike · Pixel Graphics · Arcade

Dungreed
Shared: Action Roguelike · Action · Pixel Graphics

Risk of Rain (2013)
Shared: Action Roguelike · Action · Pixel Graphics

UBERMOSH
Shared: Action · Pixel Graphics · Cyberpunk

20 Minutes Till Dawn
Shared: Action Roguelike · Top-Down Shooter · Pixel Graphics

Boneraiser Minions
Shared: Action Roguelike · Pixel Graphics · 2D

Timberman
Shared: Action · Pixel Graphics · 2D

Windowkill
Shared: Action · Action Roguelike · Arcade

Dead Cells
Shared: Action Roguelike · 2D · Pixel Graphics

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Indie

UBERMOSH:BLACK
Shared: Action · Arcade · Action Roguelike

Broforce
Shared: Action · Pixel Graphics · 2D

Hades
Shared: Action Roguelike · Action · Indie