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

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Megabonk
Shared: Action Roguelike · Roguelite · Roguelike

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

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

BALL x PIT
Shared: Action · Roguelite · Bullet Hell

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Hades
Shared: Action Roguelike · Roguelite · Action

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

Hades II
Shared: Action · Roguelite · Roguelike

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

暖雪 Warm Snow
Shared: Action Roguelike · Roguelite · Roguelike

Rogue Legacy
Shared: Action Roguelike · Action · Roguelike

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

Dungreed
Shared: Action Roguelike · Action · Roguelite

Nova Drift
Shared: Bullet Hell · Roguelite · Action Roguelike

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelike

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

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Roguelite

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

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

Cultivation Story: Reincarnation
Shared: Action Roguelike · Action · Bullet Hell

Sephiria
Shared: Action Roguelike · Roguelite · Roguelike