I ported “MarianoNinja” from “kobold2d” (cocos2d with toons of utils) to cocos2d-x.
Almost all the code is syntax adaptation, but you must change some of your code, for example I used gamecenter for achievements/leaderboard, and I needed to use an alternative (on my game I used OpenFeint on android).
And the same with Facebook and twitter integration, this was the most difficult part for me, the game was ported on two weeks (on my spare time)
I hope I help you. I apologiced for my english, I’m spanish and I need to improve my skills.
iphone version http://itunes.apple.com/ca/app/mariano-ninja!/id493895938?mt=8
android version https://play.google.com/store/apps/details?id=com.jandusoft.marianoninja