Games like Simple Survivor
Games like Simple Survivor include Vampire Survivors, BALL x PIT, Megabonk, Halls of Torment, and Brotato. We matched them by the tags players give Simple Survivor on Steam (Action, Bullet Hell, Simulation, Roguelite, and Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Roguelite · 2D

BALL x PIT
Shared: Action · Bullet Hell · Roguelite

Megabonk
Shared: Roguelite · Roguelike · Bullet Hell

Halls of Torment
Shared: Bullet Hell · Roguelite · Action

Brotato
Shared: Bullet Hell · Roguelike · Singleplayer

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

Death Must Die
Shared: Bullet Hell · Roguelite · Action

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

Hades
Shared: Roguelite · Action · Roguelike

Hades II
Shared: Action · Roguelite · Roguelike

Atomicrops
Shared: Action · Bullet Hell · Roguelike

Dead Cells
Shared: Roguelike · Roguelite · 2D

Soulstone Survivors
Shared: Bullet Hell · Roguelite · Roguelike

Enter the Gungeon
Shared: Bullet Hell · Roguelike · Action

Dungreed
Shared: Action · Roguelite · Roguelike

Returnal™
Shared: Action · Bullet Hell · Roguelike

Nuclear Throne
Shared: Roguelike · Bullet Hell · Action

Rogue Legacy
Shared: Action · Roguelike · 2D

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

Star of Providence
Shared: Bullet Hell · Roguelite · Action

Boneraiser Minions
Shared: Bullet Hell · Roguelite · 2D

Astro Prospector
Shared: Roguelike · Roguelite · Bullet Hell

Magicraft
Shared: Bullet Hell · Roguelite · Roguelike

Rocket Rats
Shared: Bullet Hell · Roguelite · Action