Games like 13 Seconds
Games like 13 Seconds include Vampire Survivors, Bit Blaster XL, BALL x PIT, Planes, Bullets and Vodka, and Nova Drift. We matched them by the tags players give 13 Seconds on Steam (Action, Casual, Bullet Hell, Roguelike, and Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Pixel Graphics · Casual

Bit Blaster XL
Shared: Bullet Hell · Shooter · Action

BALL x PIT
Shared: Action · Bullet Hell · Roguelike

Planes, Bullets and Vodka
Shared: Action · Casual · Bullet Hell

Nova Drift
Shared: Bullet Hell · Arcade · Shoot 'Em Up

Megabonk
Shared: Roguelike · Bullet Hell · Action

LUFTRAUSERS
Shared: Bullet Hell · Action · Arcade

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

Rocket Rats
Shared: Bullet Hell · Casual · Pixel Graphics

Halls of Torment
Shared: Bullet Hell · Action · Roguelike

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

Death Must Die
Shared: Bullet Hell · Action · Pixel Graphics

Huntdown
Shared: Action · Shooter · Pixel Graphics

ZeroRanger
Shared: Bullet Hell · Action · Shoot 'Em Up

Boneraiser Minions
Shared: Bullet Hell · Pixel Graphics · Casual

Commando Collection
Shared: Action · Bullet Hell · Shooter

Nuclear Throne
Shared: Roguelike · Action · Bullet Hell

Seraph's Last Stand
Shared: Casual · Bullet Hell · Roguelike

Cyberhunt
Shared: Action · Casual · Arcade

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

Brotato
Shared: Roguelike · Bullet Hell · Singleplayer

UBERMOSH
Shared: Action · Pixel Graphics · Cyberpunk

Ikaruga
Shared: Bullet Hell · Action · Arcade

Timberman
Shared: Casual · Action · Pixel Graphics