Games like Monsters and Me
Games like Monsters and Me include Vampire Survivors, Soulstone Survivors, Megabonk, Nova Drift, and Halls of Torment. We matched them by the tags players give Monsters and Me on Steam (Twin Stick Shooter, Action RPG, Action Roguelike, Bullet Hell, and Bullet Heaven): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Nova Drift
Shared: Bullet Hell · Action Roguelike · Action RPG

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

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

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

Time Wasters
Shared: Action Roguelike · Twin Stick Shooter · Bullet Heaven

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

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

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

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Twin Stick Shooter

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

Hades
Shared: Action Roguelike · Roguelite · Indie

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

Voidigo
Shared: Twin Stick Shooter · Action Roguelike · Bullet Hell

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

R.I.P. - Reincarnation Insurance Program
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

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

Twilight Survivors
Shared: Action Roguelike · Bullet Hell · Action RPG

Pesticide Not Required
Shared: Action Roguelike · Bullet Hell · Action RPG