2D Pirate Island Runner Game Code

Generate a complete 2D Pirate Island Treasure Run & Cannon Dodging game in a single HTML file using HTML5 Canvas and Web Audio API. Features multi-layered turquoise ocean parallax backgrounds, continuous speed scaling, double-jump and sliding mechanics, dynamic cannonball trajectory dodging, coin and chest collectibles, health system, interactive upgrade shop, local storage persistence, and synthesized audio SFX with zero external asset dependencies.