First of all I want to say what a great work ! I started to port my game in cocos2dx.
I have found a very nice editor open source for that doesn’t use tiles but pieced images like in Braid or Aquaria games.
Can you added the level format to be loaded by tile map engine in cocos2d x.
This could be a huge improvement for the cocos2d x visual aspect of the games.
I started to do this but I am not to familiar with the Tile map format in cocos2d.