Games like Burst Hero
Games like Burst Hero include BALL x PIT, Vampire Survivors, Nova Drift, Voidigo, and Greedland. We matched them by the tags players give Burst Hero on Steam (Shoot 'Em Up, Top-Down Shooter, Twin Stick Shooter, Bullet Hell, and Roguelite): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Roguelite · Bullet Hell · Shoot 'Em Up

Vampire Survivors
Shared: Bullet Hell · Roguelite · 2D

Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Roguelite

Voidigo
Shared: Twin Stick Shooter · Shoot 'Em Up · Bullet Hell

Greedland
Shared: Shoot 'Em Up · Twin Stick Shooter · Roguelite

Slime 3K: Rise Against Despot
Shared: Bullet Hell · Shoot 'Em Up · Roguelite

Nuclear Throne
Shared: Bullet Hell · Top-Down Shooter · Roguelike

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

Star of Providence
Shared: Shoot 'Em Up · Bullet Hell · Roguelite

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Roguelite · Twin Stick Shooter

20 Minutes Till Dawn
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Chippy
Shared: Twin Stick Shooter · Shoot 'Em Up · Bullet Hell

Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Bullet Hell

Time Wasters
Shared: Twin Stick Shooter · Bullet Hell · Shoot 'Em Up

SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Roguelite

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

Halls of Torment
Shared: Bullet Hell · Roguelite · Roguelike

SYNTHETIK 2
Shared: Top-Down Shooter · Roguelite · Twin Stick Shooter

X Invader
Shared: Shoot 'Em Up · Bullet Hell · Twin Stick Shooter

Waves
Shared: Shoot 'Em Up · Bullet Hell · Twin Stick Shooter

Nex Machina
Shared: Twin Stick Shooter · Bullet Hell · Shoot 'Em Up

Megabonk
Shared: Roguelite · Bullet Hell · Roguelike

Turnip Boy Robs a Bank
Shared: Shoot 'Em Up · Top-Down Shooter · Roguelite

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Shooter