Games like Maldhalla
Games like Maldhalla include Death Must Die, Megabonk, Halls of Torment, Vampire Survivors, and Soulstone Survivors. We matched them by the tags players give Maldhalla on Steam (Action Roguelike, Bullet Heaven, Bullet Hell, Hack and Slash, and Shoot 'Em Up): closest matches first, and among equally close ones the better-known games.

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

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

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

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

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

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

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

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

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

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

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

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

I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Hero Siege
Shared: Action Roguelike · Hack and Slash · Roguelike

Moonlighter
Shared: Hack and Slash · Action Roguelike · Roguelite

Time Wasters
Shared: Action Roguelike · Bullet Heaven · Bullet Hell