Games like Deep Sea Heroes
Games like Deep Sea Heroes include Vampire Survivors, Skul: The Hero Slayer, Enter the Gungeon, Megabonk, and Nuclear Throne. We matched them by the tags players give Deep Sea Heroes on Steam (Singleplayer, Action, Indie, Bullet Hell, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · Indie · Pixel Graphics

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

Megabonk
Shared: Indie · Action Roguelike · Bullet Hell

Nuclear Throne
Shared: Indie · Action Roguelike · Pixel Graphics

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

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

BALL x PIT
Shared: Action · Bullet Hell · Roguelite

Hades
Shared: Indie · Action Roguelike · Action

Dungreed
Shared: Action · Pixel Graphics · Action Roguelike

Death Must Die
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

Brotato
Shared: Singleplayer · Bullet Hell · Roguelike

Rogue Legacy
Shared: Indie · Action · Singleplayer

Star of Providence
Shared: Bullet Hell · Indie · Action Roguelike

Dead Cells
Shared: Roguelike · Pixel Graphics · Action Roguelike

Noobs Want to Live
Shared: Bullet Hell · Action · Pixel Graphics

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

Boneraiser Minions
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

UnderMine
Shared: Action Roguelike · Pixel Graphics · Indie

Sephiria
Shared: Action Roguelike · Action · Roguelike

Rocket Rats
Shared: Bullet Hell · Pixel Graphics · Action Roguelike

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

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

ScourgeBringer
Shared: Action · Indie · Pixel Graphics