Games like Slime Mayhem - Mythical Weapons
Games like Slime Mayhem - Mythical Weapons include Vampire Survivors, BALL x PIT, Megabonk, Halls of Torment, and Nova Drift. We matched them by the tags players give Slime Mayhem - Mythical Weapons on Steam (Action, Action Roguelike, Bullet Hell, Shoot 'Em Up, and Roguelite): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

BALL x PIT
Shared: Action · Bullet Hell · Roguelite

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

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

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Action Roguelike

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

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

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

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Action · Bullet Hell

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

Hades
Shared: Action Roguelike · Roguelite · Action

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Action

Dungreed
Shared: Action Roguelike · Action · Roguelite

Hades II
Shared: Action · Roguelite · Action Roguelike

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

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Action

Rogue Legacy
Shared: Action Roguelike · Action · Roguelike

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

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

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Roguelite