Games like DemonStar
Games like DemonStar include Vampire Survivors, Enter the Gungeon, Angel at Dusk, Broforce, and LUFTRAUSERS. We matched them by the tags players give DemonStar on Steam (Bullet Hell, Action, Shooter, Flight, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics

Enter the Gungeon
Shared: Bullet Hell · Pixel Graphics · Action

Angel at Dusk
Shared: Bullet Hell · Action · Shooter

Broforce
Shared: Action · 2D · Pixel Graphics

LUFTRAUSERS
Shared: Bullet Hell · Action · 2D

Planes, Bullets and Vodka
Shared: Action · Bullet Hell · Shooter

BALL x PIT
Shared: Action · Bullet Hell · Top-Down

Bit Blaster XL
Shared: Bullet Hell · Shooter · Action

Nuclear Throne
Shared: Bullet Hell · Action · Pixel Graphics

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

Jet Lancer
Shared: Action · Flight · Bullet Hell

Sky Force Reloaded
Shared: Bullet Hell · Action · Top-Down

Star of Providence
Shared: Bullet Hell · Action · Pixel Graphics

ZeroRanger
Shared: Bullet Hell · Action · 2D

Revolution Ace
Shared: Action · Bullet Hell · Shooter

Exit the Gungeon
Shared: Action · Bullet Hell · 2D

Hotline Miami 2: Wrong Number
Shared: Action · Pixel Graphics · Top-Down

Halls of Torment
Shared: Bullet Hell · Action · Pixel Graphics

Duck Game
Shared: Action · 2D · Pixel Graphics

Rocket Rats
Shared: Bullet Hell · Action · Pixel Graphics

Archvale
Shared: Action · Bullet Hell · 2D

Star Saviors
Shared: Bullet Hell · Action · 2D

DRAINUS
Shared: Action · Shooter · Bullet Hell

Commando Collection
Shared: Action · Shooter · Bullet Hell