Games like Compact Plasma Gears
Games like Compact Plasma Gears include Bit Blaster XL, LUFTRAUSERS, BALL x PIT, Vampire Survivors, and Nova Drift. We matched them by the tags players give Compact Plasma Gears on Steam (Shoot 'Em Up, Action, Arcade, Bullet Hell, and 2D): closest matches first, and among equally close ones the better-known games.

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

LUFTRAUSERS
Shared: Arcade · Action · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

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

DRAINUS
Shared: Shoot 'Em Up · Action · 2D

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

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

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

Exit the Gungeon
Shared: Arcade · Action · Bullet Hell

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

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

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

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

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

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

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

Dimension Tripper Neptune: TOP NEP
Shared: Action · Arcade · Shoot 'Em Up

Neptunia Shooter
Shared: Action · Shoot 'Em Up · Bullet Hell

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

ICEY
Shared: Action · Anime · 2D

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

Mirage Feathers
Shared: Shoot 'Em Up · Bullet Hell · Anime

Jet Lancer
Shared: Action · Shoot 'Em Up · 2D