Games like Overkill Squad
Games like Overkill Squad include Vampire Survivors, Enter the Gungeon, Nuclear Throne, The Binding of Isaac: Rebirth, and Realm of the Mad God Exalt. We matched them by the tags players give Overkill Squad on Steam (Twin Stick Shooter, Pixel Graphics, Bullet Hell, Action Roguelike, and Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

Enter the Gungeon
Shared: Bullet Hell · Pixel Graphics · Action Roguelike

Nuclear Throne
Shared: Pixel Graphics · Action Roguelike · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics

Realm of the Mad God Exalt
Shared: Pixel Graphics · Bullet Hell · Roguelike

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

BALL x PIT
Shared: Bullet Hell · Roguelike · Action Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

Noita
Shared: Pixel Graphics · Roguelike · Indie

Voidigo
Shared: Twin Stick Shooter · Action Roguelike · Bullet Hell

Dungreed
Shared: Pixel Graphics · Action Roguelike · Roguelike

Star of Providence
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

Death Must Die
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Pixel Graphics

Dead Cells
Shared: Pixel Graphics · Roguelike · Action Roguelike

Brotato
Shared: Bullet Hell · Roguelike · Action Roguelike

Dead Estate
Shared: Twin Stick Shooter · Action Roguelike · Roguelike

Atomicrops
Shared: Bullet Hell · Pixel Graphics · Roguelike

SYNTHETIK: Legion Rising
Shared: Action Roguelike · Indie · Top-Down Shooter

Hades
Shared: Action Roguelike · Indie · Roguelike

Boneraiser Minions
Shared: Pixel Graphics · Bullet Hell · Action Roguelike

Tiny Rogues
Shared: Bullet Hell · Action Roguelike · Top-Down Shooter

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Indie