Games like Zannon
Games like Zannon include BALL x PIT, Sky Force Reloaded, Deep Rock Galactic: Survivor, Planes, Bullets and Vodka, and Bit Blaster XL. We matched them by the tags players give Zannon on Steam (Bullet Hell, Action, Shoot 'Em Up, Top-Down Shooter, and Arcade): closest matches first, and among equally close ones the better-known games.

BALL x PIT
Shared: Action · Bullet Hell · Arcade

Sky Force Reloaded
Shared: Bullet Hell · Shoot 'Em Up · Arcade

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

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

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

DoDonPachi Resurrection
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

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

Vampire Survivors
Shared: Bullet Hell · 2D · Action

Crimzon Clover World EXplosion
Shared: Action · Bullet Hell · Shoot 'Em Up

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Action

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

Halo: Spartan Assault
Shared: Action · Top-Down Shooter · Sci-fi

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

ZeroRanger
Shared: Bullet Hell · Shoot 'Em Up · Action

Furi
Shared: Bullet Hell · Shoot 'Em Up · Action

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

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

Mushihimesama
Shared: Bullet Hell · Shoot 'Em Up · Action

Nex Machina
Shared: Bullet Hell · Action · Arcade

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

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

Brotato
Shared: Bullet Hell · Singleplayer · Sci-fi