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

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

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

LUFTRAUSERS
Shared: Bullet Hell · Indie · Action

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

Cuphead
Shared: Great Soundtrack · Indie · Bullet Hell

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

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

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

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

Vampire Survivors
Shared: Bullet Hell · Indie · 2D

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

Exit the Gungeon
Shared: Action · Indie · Bullet Hell

Just Shapes & Beats
Shared: Bullet Hell · Great Soundtrack · Indie

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

Touhou Fuujinroku ~ Mountain of Faith.
Shared: Bullet Hell · Action · Indie

Waveform
Shared: Indie · Great Soundtrack · Space

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

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

Hotline Miami
Shared: Action · Great Soundtrack · Indie

Hollow Knight
Shared: Great Soundtrack · Indie · 2D

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

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

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

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