Games like INJECTION
Games like INJECTION include Broforce, SANABI, Katana ZERO, CARRION, and BioShock Infinite. We matched them by the tags players give INJECTION on Steam (Platformer, Gore, Shooter, Action, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · Platformer · 2D

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

Katana ZERO
Shared: Action · Platformer · Pixel Graphics

CARRION
Shared: Gore · Action · Pixel Graphics

BioShock Infinite
Shared: Shooter · Action · Gore

My Friend Pedro
Shared: Action · Shooter · Gore

DOOM Eternal
Shared: Gore · Action · Shooter

MO:Astray
Shared: Action · Platformer · Gore

DOOM
Shared: Gore · Shooter · Action

Sonic Origins
Shared: Action · 2D Platformer · Platformer

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

NOT A HERO
Shared: Action · Shooter · Gore

Blasphemous
Shared: Gore · Pixel Graphics · 2D

Celeste
Shared: Platformer · 2D Platformer · Pixel Graphics

Bulletstorm: Full Clip Edition
Shared: Gore · Action · Shooter

Guns, Gore and Cannoli 2
Shared: Action · Gore · Shooter

Zombotron
Shared: Action · 2D · Shooter

Half-Life 2
Shared: Action · Shooter · Sci-fi

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

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Nine Sols
Shared: Platformer · Action · 2D

Huntdown
Shared: Shooter · Action · Pixel Graphics

People Playground
Shared: Gore · 2D · Pixel Graphics

POSTAL: Brain Damaged
Shared: Shooter · Action · Pixel Graphics