joy.js - A Joyful HTML5 2d Game Engine

The purpose of this game engine is to be fast and easy to use. It is in early stage (v0.1.1) but you can already achieve nice results with it: http://joyjs.org

It have a declarative API. You don't need to write a "main loop" or be aware of the internals of the engine (well, you shouldn't). Here is a little game prototype with sources included.

Hope you like it!