Games like Night Swarm
Games like Night Swarm include Halls of Torment, Soulstone Survivors, Death Must Die, Vampire Survivors, and Megabonk. We matched them by the tags players give Night Swarm on Steam (Bullet Heaven, Roguelite, Vampires, Action Roguelike, and Action): closest matches first, and among equally close ones the better-known games.

Halls of Torment
Shared: Roguelite · Action Roguelike · Dark Fantasy

Soulstone Survivors
Shared: Bullet Heaven · Roguelite · Action Roguelike

Death Must Die
Shared: Roguelite · Action Roguelike · Bullet Heaven

Vampire Survivors
Shared: Roguelite · Action Roguelike · Vampires

Megabonk
Shared: Bullet Heaven · Roguelite · Action Roguelike

Hades II
Shared: Roguelite · Action · Action Roguelike

Conquest Dark
Shared: Bullet Heaven · Roguelite · Action

Nordic Ashes: Survivors of Ragnarok
Shared: Bullet Heaven · Action Roguelike · Roguelite

Jotunnslayer: Hordes of Hel
Shared: Bullet Heaven · Roguelite · Action Roguelike

Hades
Shared: Roguelite · Action Roguelike · Action

The Spell Brigade
Shared: Bullet Heaven · Roguelite · Action Roguelike

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Roguelite · Action Roguelike

Black Myth: Wukong
Shared: Action · Action RPG · RPG

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Roguelite

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Bullet Heaven

Brotato
Shared: Bullet Heaven · Action Roguelike · Roguelike

暖雪 Warm Snow
Shared: Roguelite · Action Roguelike · Roguelike

Spirit Hunters: Infinite Horde
Shared: Bullet Heaven · Roguelite · Action Roguelike

Deep Rock Galactic: Survivor
Shared: Bullet Heaven · Roguelite · Action Roguelike

Curse of the Dead Gods
Shared: Action Roguelike · Roguelite · Dark Fantasy

Rogue: Genesia
Shared: Bullet Heaven · Roguelite · Action Roguelike

Goobies
Shared: Action Roguelike · Roguelite · Vampires

BALL x PIT
Shared: Roguelite · Action · Action Roguelike

Scarlet Tower
Shared: Vampires · Action Roguelike · Bullet Heaven