Games like Bulletorium
Games like Bulletorium include Nuclear Throne, BALL x PIT, SYNTHETIK: Legion Rising, Vampire Survivors, and RUINER. We matched them by the tags players give Bulletorium on Steam (Action, Top-Down Shooter, Bullet Hell, and Indie): closest matches first, and among equally close ones the better-known games.

Nuclear Throne
Shared: Indie · Action · Bullet Hell

BALL x PIT
Shared: Action · Bullet Hell · Top-Down Shooter

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action · Indie

Vampire Survivors
Shared: Bullet Hell · Indie · Action

RUINER
Shared: Action · Top-Down Shooter · Indie

Sky Force Reloaded
Shared: Bullet Hell · Top-Down Shooter · Action

20 Minutes Till Dawn
Shared: Bullet Hell · Top-Down Shooter · Indie

Megabonk
Shared: Indie · Bullet Hell · Action

Relic Hunters Zero: Remix
Shared: Action · Top-Down Shooter · Bullet Hell

The Ascent
Shared: Top-Down Shooter · Action · Indie

Hotline Miami
Shared: Action · Indie · Top-Down Shooter

UBERMOSH Vol.5
Shared: Action · Indie · Bullet Hell

UBERMOSH:BLACK
Shared: Action · Indie · Bullet Hell

RUNNING WITH RIFLES
Shared: Action · Top-Down Shooter · Indie

Enter the Gungeon
Shared: Bullet Hell · Indie · Action

UBERMOSH Vol.3
Shared: Action · Indie · Bullet Hell

Windowkill
Shared: Action · Indie · Bullet Hell

LUFTRAUSERS
Shared: Bullet Hell · Action · Indie

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · Action

12 is Better Than 6
Shared: Action · Top-Down Shooter · Indie

The Spell Brigade
Shared: Bullet Hell · Action · Top-Down Shooter

Goobies
Shared: Top-Down Shooter · Bullet Hell · Action

Killsquad
Shared: Action · Top-Down Shooter · Indie

Arms of God
Shared: Top-Down Shooter · Bullet Hell · Action