Games like NERMIUS
Games like NERMIUS include Vampire Survivors, Megabonk, Death Must Die, Astro Prospector, and Brotato. We matched them by the tags players give NERMIUS on Steam (Bullet Heaven, Incremental, Bullet Hell, Action Roguelike, and Roguelite): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Roguelite

Megabonk
Shared: Bullet Heaven · Action Roguelike · Roguelite

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

Astro Prospector
Shared: Incremental · Bullet Heaven · Action Roguelike

Brotato
Shared: Bullet Hell · Bullet Heaven · Action Roguelike

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

Soulstone Survivors
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

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

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

Boneraiser Minions
Shared: Bullet Hell · Action Roguelike · Bullet Heaven

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

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

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

20 Minutes Till Dawn
Shared: Bullet Hell · Action Roguelike · Roguelite

Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Roguelite

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

Nova Drift
Shared: Bullet Hell · Roguelite · Action Roguelike

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

Nomad Survival
Shared: Action Roguelike · Bullet Hell · Roguelite

Be My Horde
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Time Wasters
Shared: Bullet Heaven · Bullet Hell · Action Roguelike

Necrosmith
Shared: Action Roguelike · Bullet Hell · Roguelite

Karate Survivor
Shared: Bullet Heaven · Action Roguelike · Bullet Hell