Games like Scrumbag
Games like Scrumbag include Megabonk, Vampire Survivors, Deep Rock Galactic: Survivor, Brotato, and Death Must Die. We matched them by the tags players give Scrumbag on Steam (Action Roguelike, Arena Shooter, Bullet Heaven, Bullet Hell, and Action): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Death Must Die
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Nova Drift
Shared: Bullet Hell · Action Roguelike · Arena Shooter

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Difficult

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Arms of God
Shared: Action Roguelike · Bullet Heaven · Arena Shooter

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelite

Rogue: Genesia
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

Time Wasters
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

The Spell Brigade
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelite

Hades
Shared: Action Roguelike · Roguelite · Action

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

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

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Star of Providence
Shared: Action Roguelike · Bullet Hell · Roguelite