Games like Pirate Haven
Games like Pirate Haven include Megabonk, Vampire Survivors, The Binding of Isaac, Hades, and Dead Cells. We matched them by the tags players give Pirate Haven on Steam (Pirates, Procedural Generation, Roguelike, Roguelite, and Perma Death): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Roguelike · Roguelite · Action Roguelike

Vampire Survivors
Shared: Roguelite · Roguelike · Action Roguelike

The Binding of Isaac
Shared: Roguelike · Procedural Generation · Indie

Hades
Shared: Roguelite · Roguelike · Action

Dead Cells
Shared: Roguelike · Roguelite · Adventure

Pixel Piracy
Shared: Pirates · Roguelike · Procedural Generation

Crab Champions
Shared: Roguelike · Arcade · 3D

Rogue Legacy 2
Shared: Arcade · Roguelite · Action

Hades II
Shared: Roguelike · Roguelite · Action

Gunfire Reborn
Shared: Roguelike · Roguelite · Action

Spelunky
Shared: Roguelike · Procedural Generation · Arcade

BALL x PIT
Shared: Roguelite · Roguelike · Arcade

Baldi's Basics Plus
Shared: Roguelike · Procedural Generation · 3D

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

Caveblazers
Shared: Roguelite · Roguelike · Procedural Generation

Realm of Ink
Shared: Roguelite · Stylized · Roguelike

Streets of Rogue
Shared: Roguelite · Roguelike · Action

Rogue Tower
Shared: Roguelike · Procedural Generation · 3D

FTL: Faster Than Light
Shared: Roguelike · Perma Death · Procedural Generation

Halls of Torment
Shared: Roguelite · Roguelike · Arcade

Ziggurat
Shared: Roguelite · Procedural Generation · Roguelike

Noita
Shared: Roguelike · Perma Death · Roguelite

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

NECROPOLIS: BRUTAL EDITION
Shared: Roguelike · Roguelite · Procedural Generation