Games like Swarmhunters
Games like Swarmhunters include Brotato, Vampire Survivors, Deep Rock Galactic: Survivor, Nuclear Throne, and Enter the Gungeon. We matched them by the tags players give Swarmhunters on Steam (Action Roguelike, Arena Shooter, Bullet Hell, Top-Down Shooter, and PvE): closest matches first, and among equally close ones the better-known games.

Brotato
Shared: Action Roguelike · Bullet Hell · Roguelike

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

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

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

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

FatalZone
Shared: Action Roguelike · Bullet Hell · Arena Shooter

BALL x PIT
Shared: Bullet Hell · Action Roguelike · Top-Down Shooter

Pathogenic
Shared: Bullet Hell · Top-Down Shooter · Action Roguelike

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

Arms of God
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelike

Nova Drift
Shared: Bullet Hell · Action Roguelike · Arena Shooter

Glyphica: Typing Survival
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Hell · RPG

Vital Shell
Shared: Action Roguelike · Bullet Hell · Arena Shooter

SNKRX
Shared: Action Roguelike · Arena Shooter · Top-Down Shooter

Time Wasters
Shared: Action Roguelike · Bullet Hell · Arena Shooter

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

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Blazing Beaks
Shared: Action Roguelike · Top-Down Shooter · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · RPG

Noobs Are Coming
Shared: Action Roguelike · Arena Shooter · Bullet Hell