Games like Darkzan Arena
Games like Darkzan Arena include Vampire Survivors, Death Must Die, Hades, Halls of Torment, and 20 Minutes Till Dawn. We matched them by the tags players give Darkzan Arena on Steam (Action Roguelike, Bullet Hell, Shoot 'Em Up, Hack and Slash, and Souls-like): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

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

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelite

Hades II
Shared: Action Roguelike · Hack and Slash · Roguelite

Dead Cells
Shared: Action Roguelike · Roguelite · Souls-like

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Roguelite

Lost Castle
Shared: Action Roguelike · Hack and Slash · Beat 'em up

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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

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

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

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

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

Shape of Dreams
Shared: Action Roguelike · Hack and Slash · Roguelite

Asgard's Fall — Viking Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite