Games like Slimes Arena
Games like Slimes Arena include Vampire Survivors, Megabonk, BALL x PIT, Death Must Die, and 20 Minutes Till Dawn. We matched them by the tags players give Slimes Arena on Steam (Action Roguelike, Casual, Action, Bullet Hell, and Arcade): closest matches first, and among equally close ones the better-known games.

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Action

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

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

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

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

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

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

Rocket Rats
Shared: Action Roguelike · Casual · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

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

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Seraph's Last Stand
Shared: Action Roguelike · Casual · Bullet Hell

Windowkill
Shared: Action Roguelike · Action · Bullet Hell

Rogue Legacy
Shared: Action Roguelike · Action · Indie

Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

Planes, Bullets and Vodka
Shared: Casual · Action · Bullet Hell

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

Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Casual · Bullet Hell

Yet Another Zombie Survivors
Shared: Action Roguelike · Arcade · Indie

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Action

Astro Prospector
Shared: Casual · Action Roguelike · Bullet Hell

Noobs Want to Live
Shared: Bullet Hell · Action · Action Roguelike