Games like Slime Mayhem
Games like Slime Mayhem include Vampire Survivors, BALL x PIT, Megabonk, Nova Drift, and Halls of Torment. We matched them by the tags players give Slime Mayhem on Steam (Action Roguelike, Bullet Hell, Shoot 'Em Up, Roguelite, and Shooter): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite
BALL x PIT
Shared: Bullet Hell · Roguelite · Action Roguelike
Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell
Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Action Roguelike
Halls of Torment
Shared: Action Roguelike · Bullet Hell · Roguelite
Death Must Die
Shared: Action Roguelike · Bullet Hell · Roguelite
20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite
Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike
Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Roguelike
Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite
Star of Providence
Shared: Bullet Hell · Action Roguelike · Roguelite
Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite
Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike
Hades
Shared: Action Roguelike · Roguelite · Roguelike
Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · Roguelike
Rocket Rats
Shared: Action Roguelike · Bullet Hell · Roguelite
Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Roguelite
Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · Shooter
Dungreed
Shared: Action Roguelike · Roguelite · Roguelike
Rogue Legacy
Shared: Action Roguelike · Roguelike · Roguelite
Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite
Risk of Rain 2
Shared: Action Roguelike · Roguelite · Roguelike
I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up
Seraph's Last Stand
Shared: Action Roguelike · Bullet Hell · 2D