Games like Galactic Retribution Vol.1
Games like Galactic Retribution Vol.1 include Planes, Bullets and Vodka, Cyberhunt, LUFTRAUSERS, ARCADE GAME SERIES: GALAGA, and Vampire Survivors. We matched them by the tags players give Galactic Retribution Vol.1 on Steam (Arcade, Action, Shoot 'Em Up, Retro, and 2D): closest matches first, and among equally close ones the better-known games.

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

LUFTRAUSERS
Shared: Arcade · Action · Shoot 'Em Up

ARCADE GAME SERIES: GALAGA
Shared: Arcade · Action · Shoot 'Em Up

Vampire Survivors
Shared: Pixel Graphics · 2D · Arcade

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

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

UFO 50
Shared: Action · Retro · Arcade

METAL SLUG
Shared: Arcade · Action · 2D

ZeroRanger
Shared: Shoot 'Em Up · Action · Arcade

Broforce
Shared: Action · Pixel Graphics · 2D

Kung Fury: Street Rage - Ultimate Edition
Shared: Arcade · Action · Retro

METAL SLUG X
Shared: Arcade · Action · Shoot 'Em Up

Blazing Chrome
Shared: Action · Retro · Shoot 'Em Up

Distant Space
Shared: Arcade · Shoot 'Em Up · Action

Hotline Miami
Shared: Action · Pixel Graphics · Retro

DRAINUS
Shared: Action · Shoot 'Em Up · 2D

BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up

Star Saviors
Shared: Shoot 'Em Up · Action · Arcade

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

Nova Drift
Shared: Shoot 'Em Up · Arcade · Action

METAL SLUG 3
Shared: Arcade · Action · Retro

Timberman
Shared: Action · Pixel Graphics · Arcade

Warhammer 40,000: Boltgun
Shared: Retro · Action · Pixel Graphics