Creative Box

Hello, I've been working on a game on and off for a while - named, Creative Box. I am creating it in JQuery, but I am not too skilled with this programming language. My game can be found here: [login to view URL] Currently it is broken, and your character does not show up, but you can understand how the game works there. I need this game to be more efficient, and to have multiplayer, so people can play with each other. I need you to make a few fixes to the game (small ones) too. Please be good at English to bid here, it's best if we can communicate well.