Games like Nanoplanet Survivors
Games like Nanoplanet Survivors include Vampire Survivors, BALL x PIT, 20 Minutes Till Dawn, Enter the Gungeon, and Bit Blaster XL. We matched them by the tags players give Nanoplanet Survivors on Steam (2D, Bullet Hell, Shoot 'Em Up, Survival, and Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · 2D · Pixel Graphics

BALL x PIT
Shared: Bullet Hell · Action · Roguelike

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

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Pixel Graphics

Bit Blaster XL
Shared: Bullet Hell · Shoot 'Em Up · 2D

Terraria
Shared: 2D · Survival · Pixel Graphics

Brotato
Shared: Bullet Hell · Roguelike · Survival

Megabonk
Shared: Roguelike · Bullet Hell · Survival

Death Must Die
Shared: Bullet Hell · 2D · Pixel Graphics

Nuclear Throne
Shared: Roguelike · Bullet Hell · Pixel Graphics

Cyberhunt
Shared: Shoot 'Em Up · 2D · Action

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · 2D

Halls of Torment
Shared: Bullet Hell · Roguelike · Pixel Graphics

I Am Legion: Stand Survivors
Shared: Bullet Hell · Shoot 'Em Up · 2D

Hero Siege
Shared: Pixel Graphics · Roguelike · Top-Down

Archvale
Shared: Bullet Hell · 2D · Action

Stoneshard
Shared: Roguelike · Survival · 2D

The Escapists
Shared: 2D · Pixel Graphics · Survival

Skul: The Hero Slayer
Shared: 2D · Roguelike · Action

Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · 2D

Noita
Shared: Roguelike · 2D · Pixel Graphics

Dead Cells
Shared: Roguelike · 2D · Adventure

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

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