Games like Star Hunter DX
Games like Star Hunter DX include Bit Blaster XL, Vampire Survivors, DRAINUS, ZeroRanger, and Nova Drift. We matched them by the tags players give Star Hunter DX on Steam (Action, Shoot 'Em Up, Bullet Hell, 2D, and Sci-fi): closest matches first, and among equally close ones the better-known games.

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

Vampire Survivors
Shared: Bullet Hell · 2D · Action

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

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

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

BALL x PIT
Shared: Action · Bullet Hell · Arcade

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

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

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

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

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

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

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

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

METAL SLUG
Shared: Action · 2D · Shoot 'Em Up

ICEY
Shared: Action · Female Protagonist · 2D

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

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

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

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

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

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

Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Action · Shoot 'Em Up · Bullet Hell

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