Games like Starium
Games like Starium include Vampire Survivors, Drova - Forsaken Kin, Death Must Die, Undertale, and Halls of Torment. We matched them by the tags players give Starium on Steam (Bullet Hell, 2D, Choices Matter, Action RPG, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics
Drova - Forsaken Kin
Shared: Action RPG · 2D · Pixel Graphics
Death Must Die
Shared: Bullet Hell · Pixel Graphics · Action Roguelike
Undertale
Shared: Choices Matter · Pixel Graphics · 2D
Halls of Torment
Shared: Bullet Hell · Pixel Graphics · Action Roguelike
Hero Siege
Shared: Action RPG · Pixel Graphics · Action Roguelike
HoloCure - Save the Fans!
Shared: Bullet Hell · Pixel Graphics · 2D
Enter the Gungeon
Shared: Bullet Hell · Pixel Graphics · Action Roguelike
Mass Effect™ Legendary Edition
Shared: Choices Matter · Sci-fi · Action RPG
Skul: The Hero Slayer
Shared: 2D · Pixel Graphics · Action Roguelike
Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Hell · Action Roguelike · Action RPG
Rabi-Ribi
Shared: Bullet Hell · Metroidvania · Pixel Graphics
Boneraiser Minions
Shared: Bullet Hell · 2D · Pixel Graphics
DELTARUNE
Shared: Pixel Graphics · Bullet Hell · 2D
Dead Cells
Shared: 2D · Pixel Graphics · Metroidvania
OneShot
Shared: Pixel Graphics · Choices Matter · 2D
Starfield
Shared: Sci-fi · Exploration · Character Customization
CrossCode
Shared: Action RPG · Pixel Graphics · 2D
Minishoot' Adventures
Shared: Bullet Hell · Metroidvania · 2D
The Outer Worlds 2
Shared: Action RPG · Sci-fi · Exploration
Axiom Verge
Shared: Pixel Graphics · Metroidvania · 2D
Touhou Luna Nights
Shared: Bullet Hell · Metroidvania · 2D
Hollow Knight
Shared: 2D · Metroidvania · Exploration
Noobs Want to Live
Shared: Bullet Hell · Pixel Graphics · Action RPG