Games like Merlin Survivors
Games like Merlin Survivors include Vampire Survivors, Megabonk, Risk of Rain 2, Crab Champions, and Halls of Torment. We matched them by the tags players give Merlin Survivors on Steam (Action Roguelike, Bullet Hell, Souls-like, Third-Person Shooter, and Action): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

Risk of Rain 2
Shared: Action Roguelike · Third-Person Shooter · Roguelite

Crab Champions
Shared: Action Roguelike · Third-Person Shooter · Bullet Hell

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

Brotato
Shared: Bullet Hell · Action Roguelike · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Hades
Shared: Action Roguelike · Roguelite · Action

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

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

Nova Drift
Shared: Bullet Hell · Action Roguelike · Roguelite

Hades II
Shared: Action · Action Roguelike · Roguelite

Pass the Fear
Shared: Action Roguelike · Bullet Hell · Roguelite

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

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

REMNANT II®
Shared: Souls-like · Third-Person Shooter · Action

Magicraft
Shared: Action Roguelike · Bullet Hell · Roguelite

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

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

Goobies
Shared: Action Roguelike · Bullet Hell · Roguelite

Returnal™
Shared: Bullet Hell · Action · Action Roguelike

Rocket Rats
Shared: Action Roguelike · Bullet Hell · Roguelite

Black Myth: Wukong
Shared: Souls-like · Action · Action-Adventure