Games like Doomsday Hunters
Games like Doomsday Hunters include Enter the Gungeon, The Binding of Isaac: Rebirth, Vampire Survivors, Nuclear Throne, and Dead Estate. We matched them by the tags players give Doomsday Hunters on Steam (Arcade, Twin Stick Shooter, Difficult, Perma Death, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

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

The Binding of Isaac: Rebirth
Shared: Difficult · Action Roguelike · Dungeon Crawler

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Arcade

Nuclear Throne
Shared: Difficult · Action Roguelike · Bullet Hell

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

Noita
Shared: Difficult · Dungeon Crawler · Perma Death

Rogue: Genesia
Shared: Arcade · Bullet Hell · Twin Stick Shooter

Megabonk
Shared: Action Roguelike · Bullet Hell · Arcade

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

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

UBERMOSH
Shared: Arcade · Cyberpunk · Twin Stick Shooter

Star of Providence
Shared: Bullet Hell · Difficult · Action Roguelike

Hades
Shared: Action Roguelike · Roguelite · Dungeon Crawler

The Binding of Isaac
Shared: Difficult · Action Roguelike · Indie

Windowkill
Shared: Arcade · Bullet Hell · Twin Stick Shooter

Tiny Rogues
Shared: Bullet Hell · Difficult · Action Roguelike

Dungreed
Shared: Action Roguelike · Difficult · Dungeon Crawler

UBERMOSH:BLACK
Shared: Arcade · Bullet Hell · Action Roguelike

Noobs Want to Live
Shared: Bullet Hell · 2.5D · Action Roguelike

Spelunky
Shared: Difficult · Action Roguelike · Arcade

Risk of Rain (2013)
Shared: Action Roguelike · Difficult · Perma Death

Skul: The Hero Slayer
Shared: Action Roguelike · Difficult · Pixel Graphics

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

Exit the Gungeon
Shared: Arcade · Bullet Hell · Difficult