Games like Squad Killer
Games like Squad Killer include Vampire Survivors, Planes, Bullets and Vodka, Alex Jones: NWO Wars, Huntdown, and Broforce. We matched them by the tags players give Squad Killer on Steam (Action, Casual, Arcade, Roguelike, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Casual · Roguelike · Pixel Graphics

Planes, Bullets and Vodka
Shared: Action · Casual · Arcade

Alex Jones: NWO Wars
Shared: Action · Arcade · Shooter

Huntdown
Shared: Action · Shooter · Side Scroller

Broforce
Shared: Action · Pixel Graphics · 2D

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

BALL x PIT
Shared: Action · Arcade · Roguelike

Skul: The Hero Slayer
Shared: Action · Roguelike · Indie

METAL SLUG
Shared: Action · Arcade · Side Scroller

Terminator 2D: NO FATE
Shared: Action · Arcade · 2D Platformer

Cyberhunt
Shared: Action · Casual · Arcade

METAL SLUG 3
Shared: Action · Arcade · Shooter

UFO 50
Shared: Action · Arcade · Pixel Graphics

LUFTRAUSERS
Shared: Action · Arcade · Indie

Downwell
Shared: Arcade · Action · 2D Platformer

Timberman
Shared: Casual · Action · Arcade

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

Megabonk
Shared: Roguelike · Action · Arcade

SANABI
Shared: Action · 2D Platformer · Pixel Graphics

Blazing Chrome
Shared: Action · Arcade · Side Scroller

Exit the Gungeon
Shared: Action · Arcade · Indie

Rogue Legacy
Shared: Roguelike · Action · Indie

Door Kickers: Action Squad
Shared: Action · 2D Platformer · Shooter

Contra: Operation Galuga
Shared: Action · Arcade · Shooter