Games like Cure for Danmaku Synd
Games like Cure for Danmaku Synd include Nova Drift, Deep Rock Galactic: Survivor, 20 Minutes Till Dawn, Chippy, and Brotato. We matched them by the tags players give Cure for Danmaku Synd on Steam (Arena Shooter, Medical Sim, Bullet Hell, Shoot 'Em Up, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arena Shooter

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

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

Chippy
Shared: Arena Shooter · Bullet Hell · Shoot 'Em Up

Brotato
Shared: Bullet Hell · Arena Shooter · Singleplayer

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

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

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

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Bullet Hell · Shoot 'Em Up · Singleplayer

BALL x PIT
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Glyphica: Typing Survival
Shared: Arena Shooter · Bullet Hell · Top-Down Shooter

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

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

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Star Saviors
Shared: Bullet Hell · Shoot 'Em Up · Indie

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Bullet Hell · Shoot 'Em Up · Shooter

State of Anarchy: Master of Mayhem
Shared: Bullet Hell · Top-Down Shooter · Arena Shooter

Strike Force Heroes
Shared: Arena Shooter · Shooter · Character Customization

LUFTRAUSERS
Shared: Bullet Hell · Shoot 'Em Up · Indie

BEEP
Shared: Indie · Puzzle · Singleplayer

Bot Vice
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

Titan Attacks!
Shared: Arena Shooter · Bullet Hell · Shoot 'Em Up

DRAINUS
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Shooter