Games like Knight Survivor
Games like Knight Survivor include Vampire Survivors, Enter the Gungeon, Nuclear Throne, Megabonk, and Halls of Torment. We matched them by the tags players give Knight Survivor on Steam (Action Roguelike, Action, Bullet Hell, PvE, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · 2D

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

Nuclear Throne
Shared: Action Roguelike · Roguelike · Bullet Hell

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

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

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

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

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics

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

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

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

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

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

Dungreed
Shared: Action Roguelike · Action · Roguelike

Hero Siege
Shared: Action Roguelike · Pixel Graphics · Roguelike

Risk of Rain Returns
Shared: Action Roguelike · PvE · 2D

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

Risk of Rain (2013)
Shared: Action Roguelike · Action · Roguelike

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike

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

Atomicrops
Shared: Action · Bullet Hell · Action Roguelike

Dead Cells
Shared: Action Roguelike · Roguelike · 2D

HELLDIVERS™ 2
Shared: PvE · Action · Shooter

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Action