Games like Space Mages: Dimension 33
Games like Space Mages: Dimension 33 include Bit Blaster XL, Nova Drift, Ikaruga, Star Saviors, and ZeroRanger. We matched them by the tags players give Space Mages: Dimension 33 on Steam (Magic, Shoot 'Em Up, Bullet Hell, Space, and Difficult): closest matches first, and among equally close ones the better-known games.

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

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

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

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

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

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

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

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Bullet Hell · Shoot 'Em Up · Difficult

Enter the Gungeon
Shared: Bullet Hell · Difficult · Pixel Graphics

FTL: Faster Than Light
Shared: Space · Difficult · Perma Death

R-Type Final 2
Shared: Shoot 'Em Up · Space · Side Scroller

Bot Vice
Shared: Shoot 'Em Up · Bullet Hell · Difficult

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

Assault Android Cactus+
Shared: Bullet Hell · Shoot 'Em Up · Difficult

DARIUSBURST Chronicle Saviours
Shared: Shoot 'Em Up · Bullet Hell · Side Scroller

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

Syder Arcade
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Sine Mora
Shared: Shoot 'Em Up · Bullet Hell · Shooter

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

Huntdown
Shared: Shoot 'Em Up · Shooter · Side Scroller

Super Galaxy Squadron EX Turbo
Shared: Shoot 'Em Up · Bullet Hell · Difficult

Cuphead
Shared: Difficult · Bullet Hell · Shoot 'Em Up

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

Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Space