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

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

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

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

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

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

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

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

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

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

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

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

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

Nex Machina
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Crimzon Clover World EXplosion
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

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

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

Touhou Kinjoukyou ~ Fossilized Wonders.
Shared: Shoot 'Em Up · Bullet Hell · Shooter

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

BLUE REVOLVER
Shared: Shoot 'Em Up · Bullet Hell · Arcade

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

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

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

Sektori
Shared: Shoot 'Em Up · Bullet Hell · Arcade

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