Games like Eisen
Games like Eisen include Hades, Vampire Survivors, Death Must Die, Halls of Torment, and Megabonk. We matched them by the tags players give Eisen on Steam (Indie, Action Roguelike, Top-Down Shooter, Action, and Fantasy): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Indie · Action

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Indie

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

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

Megabonk
Shared: Action Roguelike · Indie · Bullet Hell

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

Hero Siege
Shared: Action Roguelike · RPG · Indie

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Action

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

Nuclear Throne
Shared: Action Roguelike · Indie · Action

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

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

Yet Another Zombie Survivors
Shared: Action Roguelike · Top-Down Shooter · Indie

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

Heroes of Hammerwatch II
Shared: Action Roguelike · RPG · Action

Rogue Legacy
Shared: Indie · Action Roguelike · Action

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

Realm of the Mad God Exalt
Shared: Action Roguelike · Bullet Hell · Indie

Tiny Rogues
Shared: Action Roguelike · Top-Down Shooter · Bullet Hell

Sephiria
Shared: Action Roguelike · Action · RPG

SYNTHETIK: Legion Rising
Shared: Indie · Top-Down Shooter · Action Roguelike

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

Twilight Survivors
Shared: Action Roguelike · Indie · Bullet Hell