Games like Monsteria
Games like Monsteria include Vampire Survivors, BALL x PIT, Megabonk, 20 Minutes Till Dawn, and Nova Drift. We matched them by the tags players give Monsteria on Steam (Top-Down Shooter, Shoot 'Em Up, Bullet Hell, Arcade, and Indie): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Bullet Hell · Indie · Pixel Graphics
BALL x PIT
Shared: Bullet Hell · Arcade · Shoot 'Em Up
Megabonk
Shared: Bullet Hell · Indie · Action Roguelike
20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter
Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Nuclear Throne
Shared: Indie · Bullet Hell · Top-Down Shooter
Enter the Gungeon
Shared: Bullet Hell · Indie · Pixel Graphics
LUFTRAUSERS
Shared: Bullet Hell · Indie · Arcade
Brotato
Shared: Bullet Hell · Singleplayer · Roguelike
Halls of Torment
Shared: Bullet Hell · Pixel Graphics · Action Roguelike
Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · Indie
Skul: The Hero Slayer
Shared: Indie · Action · Pixel Graphics
Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Arcade
Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Bullet Hell
Boneraiser Minions
Shared: Bullet Hell · Pixel Graphics · Indie
Rocket Rats
Shared: Bullet Hell · Pixel Graphics · Action Roguelike
The Binding of Isaac: Rebirth
Shared: Indie · Action Roguelike · Pixel Graphics
Slime 3K: Rise Against Despot
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter
Apocalypse Party
Shared: Top-Down Shooter · Bullet Hell · Singleplayer
Cyberhunt
Shared: Indie · Shoot 'Em Up · Arcade
Yet Another Zombie Survivors
Shared: Top-Down Shooter · Indie · Arcade
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Indie
SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Arcade