Games like Blazeo
Games like Blazeo include Vampire Survivors, BALL x PIT, Megabonk, Brotato, and Nuclear Throne. We matched them by the tags players give Blazeo on Steam (Bullet Hell, Action, Roguelite, Roguelike, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Roguelite · Roguelike

BALL x PIT
Shared: Action · Roguelite · Bullet Hell

Megabonk
Shared: Roguelite · Roguelike · Bullet Hell

Brotato
Shared: Bullet Hell · Roguelike · Roguelite

Nuclear Throne
Shared: Roguelike · Bullet Hell · Action

Halls of Torment
Shared: Bullet Hell · Roguelite · Roguelike

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Twin Stick Shooter

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

Rogue: Genesia
Shared: Bullet Hell · Roguelite · Twin Stick Shooter

Rocket Rats
Shared: Bullet Hell · Roguelite · Action

Nova Drift
Shared: Bullet Hell · Roguelite · Arcade

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

The Spell Brigade
Shared: Bullet Hell · Roguelite · Roguelike

Greedland
Shared: Roguelite · Bullet Hell · Twin Stick Shooter

Death Must Die
Shared: Bullet Hell · Roguelite · Action

Yet Another Zombie Survivors
Shared: Roguelite · Top-Down Shooter · Roguelike

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

Hades
Shared: Roguelite · Action · Roguelike

Blazing Beaks
Shared: Roguelike · Roguelite · Action

UBERMOSH:BLACK
Shared: Action · Bullet Hell · Roguelike

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

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

Soulstone Survivors
Shared: Bullet Hell · Roguelite · Roguelike

Star of Providence
Shared: Bullet Hell · Roguelite · Action