In this tutorial, you will port the raywenderlich.com classic Ninjas Going Pew-Pew game to Cocos2D-Javascript. I like implementing this game when learning new frameworks because it's simple, but covers the most important aspects of making a game.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/2770-how-to-make-a-cross-platform-game-with-cocos2d-javascript-tutorial-getting-started