Games like Avenger
Games like Avenger include Huntdown, Broforce, Door Kickers: Action Squad, METAL SLUG, and SANABI. We matched them by the tags players give Avenger on Steam (Shoot 'Em Up, Action, 1990's, Shooter, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Huntdown
Shared: Action · Pixel Graphics · Shooter

Broforce
Shared: Action · Pixel Graphics · 2D

Door Kickers: Action Squad
Shared: Action · Pixel Graphics · Shooter

METAL SLUG
Shared: Action · Shoot 'Em Up · 2D

SANABI
Shared: Action · Pixel Graphics · 2D

Terminator 2D: NO FATE
Shared: Action · Pixel Graphics · Shooter

BALL x PIT
Shared: Action · Shoot 'Em Up · Top-Down Shooter

Alex Jones: NWO Wars
Shared: Action · Shoot 'Em Up · Shooter

Contra Anniversary Collection
Shared: Action · Shooter · 2D

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

METAL SLUG X
Shared: Action · Shoot 'Em Up · 2D

DRAINUS
Shared: Shoot 'Em Up · Action · Shooter

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

Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Action

DEVIL BLADE REBOOT
Shared: Shoot 'Em Up · Action · Shooter

Vampire Survivors
Shared: Pixel Graphics · 2D · Action

METAL SLUG 2
Shared: Action · Shoot 'Em Up · 2D

Guns, Gore and Cannoli 2
Shared: Action · Shoot 'Em Up · Shooter

METAL SLUG 3
Shared: Action · Shooter · Shoot 'Em Up

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

DoDonPachi Resurrection
Shared: Shoot 'Em Up · Top-Down Shooter · Shooter

Half-Life
Shared: 1990's · Action · Shooter

Sky Force Reloaded
Shared: Shoot 'Em Up · Action · Top-Down Shooter

Katana ZERO
Shared: Action · Pixel Graphics · 2D