As most will know, Cocos2D based on Objective-C, is currently not cross platform. For those of you who love Cocos2D, but who needs to also release on other platforms than iOS, I have written a series of tutorials on how to migrate to -x.
Apart from that, I have written two game demos, demonstrating a lot of the various techniques you need in Cocos2D, to write a game. The games are written 1:1, meaning that you can see how the code works in -objc, and then directly see what that would like like in -x
The two demos are available on Github
If you have feedback, / suggestions / bug-reports, please post them in the forum