Games like Mutant Legion
Games like Mutant Legion include Hotline Miami, Hotline Miami 2: Wrong Number, Skul: The Hero Slayer, Huntdown, and Broforce. We matched them by the tags players give Mutant Legion on Steam (Action, Shoot 'Em Up, Singleplayer, 2D, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Hotline Miami
Shared: Action · Pixel Graphics · Violent

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Violent

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

Huntdown
Shared: Action · Pixel Graphics · Shoot 'Em Up

Broforce
Shared: Action · Pixel Graphics · 2D

Katana ZERO
Shared: Action · Pixel Graphics · 2D

My Friend Pedro
Shared: Action · Shooter · Indie

CARRION
Shared: Action · Pixel Graphics · 2D

LUFTRAUSERS
Shared: Action · Shoot 'Em Up · Pixel Graphics

DRAINUS
Shared: Action · Shoot 'Em Up · Singleplayer

SANABI
Shared: Action · Pixel Graphics · Singleplayer

Blasphemous
Shared: Pixel Graphics · 2D · Action

Vampire Survivors
Shared: Pixel Graphics · 2D · Singleplayer

People Playground
Shared: 2D · Singleplayer · Violent

Call of Duty®
Shared: Action · Singleplayer · Shooter

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · 2D

The Final Station
Shared: Pixel Graphics · 2D · Action

Let Them Come
Shared: Action · 2D · Pixel Graphics

DEADBOLT
Shared: Pixel Graphics · Action · 2D

Zombotron
Shared: Action · 2D · Singleplayer

NOT A HERO
Shared: Action · Pixel Graphics · Shooter

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · 2D · Singleplayer

Dungeon Munchies
Shared: Action · Pixel Graphics · Indie

Blazing Chrome
Shared: Action · Pixel Graphics · Shoot 'Em Up