Games like DemonCountdown
Games like DemonCountdown include Enter the Gungeon, Dead Estate, Voidigo, Vampire Survivors, and BALL x PIT. We matched them by the tags players give DemonCountdown on Steam (Action Roguelike, Bullet Hell, Twin Stick Shooter, Shoot 'Em Up, and Roguelike): closest matches first, and among equally close ones the better-known games.

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

Dead Estate
Shared: Action Roguelike · Twin Stick Shooter · Roguelike

Voidigo
Shared: Action Roguelike · Twin Stick Shooter · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

BALL x PIT
Shared: Bullet Hell · Action Roguelike · Roguelike

Blazing Beaks
Shared: Action Roguelike · Roguelike · Shooter

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Action Roguelike

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

Returnal™
Shared: Bullet Hell · Roguelike · Action Roguelike

Star of Providence
Shared: Bullet Hell · Action Roguelike · Shoot 'Em Up

Time Wasters
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Procedural Generation

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike

Rogue: Genesia
Shared: Bullet Hell · Action Roguelike · Twin Stick Shooter

Assault Android Cactus+
Shared: Bullet Hell · Twin Stick Shooter · Shoot 'Em Up

Risk of Rain 2
Shared: Action Roguelike · Roguelike · Shooter

Pass the Fear
Shared: Action Roguelike · Bullet Hell · Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Bullet Hell

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

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Crab Champions
Shared: Action Roguelike · Roguelike · Bullet Hell

Greedland
Shared: Shoot 'Em Up · Twin Stick Shooter · Bullet Hell

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Roguelike

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