Games like Dungeon Watchers
Games like Dungeon Watchers include Vampire Survivors, Megabonk, Brotato, Enter the Gungeon, and Death Must Die. We matched them by the tags players give Dungeon Watchers on Steam (Indie, Action Roguelike, Bullet Hell, Roguelike, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Indie

Megabonk
Shared: Action Roguelike · Indie · Roguelike

Brotato
Shared: Roguelike · Bullet Hell · Action Roguelike

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

Death Must Die
Shared: Action Roguelike · Bullet Hell · 2D

Hades
Shared: Action Roguelike · Indie · Roguelike

Rogue Legacy
Shared: Indie · Action Roguelike · Roguelike

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

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

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Indie · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Bullet Hell · Roguelike

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Indie

The Binding of Isaac
Shared: Action Roguelike · Indie · Roguelike

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

Nuclear Throne
Shared: Action Roguelike · Indie · Roguelike

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

Hades II
Shared: Roguelike · Action Roguelike · Action

Windowkill
Shared: Indie · Action Roguelike · Bullet Hell

Dungreed
Shared: Action Roguelike · Roguelike · Indie

Yet Another Zombie Survivors
Shared: Action Roguelike · Indie · Roguelike

Hero Siege
Shared: Action Roguelike · Roguelike · Indie

Spelunky
Shared: Action Roguelike · Indie · Roguelike

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

Risk of Rain (2013)
Shared: Action Roguelike · Indie · Roguelike