Games like One Million Stars
Games like One Million Stars include Vampire Survivors, BALL x PIT, Halls of Torment, Megabonk, and Nova Drift. We matched them by the tags players give One Million Stars on Steam (Action, Psychedelic, Arcade, Action Roguelike, and Hand-drawn): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

BALL x PIT
Shared: Action · Arcade · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Action · Bullet Hell

Megabonk
Shared: Action Roguelike · Action · Bullet Hell

Nova Drift
Shared: Arcade · Action Roguelike · Bullet Hell

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · Action

Hades
Shared: Action Roguelike · Action · Roguelite

Windowkill
Shared: Action · Action Roguelike · Arcade

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Indie

Rogue: Genesia
Shared: Action Roguelike · Arcade · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Action · Bullet Hell

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Action

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Action · Bullet Hell

Death Must Die
Shared: Action Roguelike · Bullet Hell · Action

The Spell Brigade
Shared: Action Roguelike · Bullet Hell · Action

Picayune Dreams
Shared: Psychedelic · Action Roguelike · Bullet Hell

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Rogue Legacy 2
Shared: Arcade · Action · Roguelite

Glyphica: Typing Survival
Shared: Action Roguelike · Action · Bullet Hell

Zombieville USA 3D
Shared: Action · Arcade · Action Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Action

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Roguelite

Rocket Rats
Shared: Action Roguelike · Action · Bullet Hell

Hades II
Shared: Action · Action Roguelike · Roguelite