Breakouts -- CreateJS
CreateJS is a feature rich and powerful set of libraries for creating iteractive web content. It's not specifically a game engine, but lends itself well to games. It is composed of TweenJS, SoundJS, EaselJS and PreloadJS
CreateJS is open source under the MIT license
Web: www.createjs.com Documentation
Source : https://github.com/CreateJS
Revised version with core game mechanics illustrating the game engine features. (sprite, tweening, asset preloading, sound playback...) Extra game mechanics like power up/down have been removed.