Games like Noxious Weeds
Games like Noxious Weeds include Megabonk, Vampire Survivors, Enter the Gungeon, Death Must Die, and Soulstone Survivors. We matched them by the tags players give Noxious Weeds on Steam (Action Roguelike, Bullet Heaven, Bullet Hell, Roguelike, and Difficult): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Roguelike

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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

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

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

Brotato
Shared: Action Roguelike · Roguelike · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

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

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

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

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

Hades
Shared: Action Roguelike · Roguelite · Roguelike

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

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

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Difficult

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

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

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

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelike

Atomicrops
Shared: Bullet Hell · Roguelike · Action Roguelike

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

Pathogenic
Shared: Bullet Hell · Roguelike · Bullet Heaven