Games like A Bullet for a Swarm
Games like A Bullet for a Swarm include Vampire Survivors, Skul: The Hero Slayer, Death Must Die, Hades, and Megabonk. We matched them by the tags players give A Bullet for a Swarm on Steam (Action, Casual, Action Roguelike, Roguelike, and Roguelite): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Pixel Graphics

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

Death Must Die
Shared: Action Roguelike · Roguelite · Action

Hades
Shared: Action Roguelike · Roguelite · Action

Megabonk
Shared: Action Roguelike · Roguelike · Roguelite

BALL x PIT
Shared: Action · Roguelite · Roguelike

Dungreed
Shared: Action Roguelike · Action · Roguelike

Dead Cells
Shared: Roguelike · Action Roguelike · Roguelite

Rogue Legacy
Shared: Roguelike · Action · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

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

Hades II
Shared: Action · Roguelike · Roguelite

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

Sephiria
Shared: Action Roguelike · Roguelike · Roguelite

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

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Pixel Graphics

Noita
Shared: Roguelike · Pixel Graphics · 2D

UnderMine
Shared: Action Roguelike · Roguelite · Action

Wizard of Legend
Shared: Action Roguelike · Roguelike · Action

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · Roguelike

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Pixel Graphics

Star of Providence
Shared: Action Roguelike · Roguelite · Action

20 Minutes Till Dawn
Shared: Action Roguelike · Roguelite · Shoot 'Em Up