Games like So Many Zombies
Games like So Many Zombies include Megabonk, Vampire Survivors, Brotato, 20 Minutes Till Dawn, and Yet Another Zombie Survivors. We matched them by the tags players give So Many Zombies on Steam (Action Roguelike, Bullet Hell, 3D, Indie, and Survival): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Hell · Indie

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Indie

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Survival

Yet Another Zombie Survivors
Shared: Action Roguelike · Indie · Zombies

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

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

Nuclear Throne
Shared: Action Roguelike · Indie · Bullet Hell

Hades
Shared: Action Roguelike · Indie · Action

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Apocalypse Party
Shared: Action Roguelike · Bullet Hell · Singleplayer

FatalZone
Shared: Action Roguelike · Bullet Hell · Survival

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

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

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

Crab Champions
Shared: Action Roguelike · 3D · Bullet Hell

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

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

Resident Evil 4
Shared: Action · Horror · Survival

Atomicrops
Shared: Bullet Hell · Action Roguelike · Action

Magicraft
Shared: Action Roguelike · Bullet Hell · Top-Down

SKYHILL
Shared: Action Roguelike · Survival · Indie