Games like ZeroRanger
Games like ZeroRanger include LUFTRAUSERS, Vampire Survivors, Hotline Miami, Star Saviors, and Ikaruga. We matched them by the tags players give ZeroRanger on Steam (Shoot 'Em Up, Indie, Bullet Hell, Action, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

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

Vampire Survivors
Shared: Bullet Hell · Indie · Pixel Graphics

Hotline Miami
Shared: Great Soundtrack · Indie · Action

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

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

Katana ZERO
Shared: Great Soundtrack · Action · Pixel Graphics

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

Hotline Miami 2: Wrong Number
Shared: Great Soundtrack · Pixel Graphics · Action

UBERMOSH
Shared: Indie · Great Soundtrack · Action

Celeste
Shared: Indie · Great Soundtrack · Pixel Graphics

Undertale
Shared: Great Soundtrack · Pixel Graphics · Indie

Cuphead
Shared: Great Soundtrack · Indie · 2D

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

Jet Lancer
Shared: Indie · Shoot 'Em Up · Action

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

DELTARUNE
Shared: Great Soundtrack · Pixel Graphics · Bullet Hell

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

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

Exit the Gungeon
Shared: Indie · Bullet Hell · Action

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

DRAINUS
Shared: Shoot 'Em Up · Indie · Action

Shovel Knight: Treasure Trove
Shared: Indie · Great Soundtrack · Pixel Graphics

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · 2D

Savant - Ascent
Shared: Indie · Shoot 'Em Up · Action