Hi and thanks for the great game engine!
After fiddling about with cocos2d 2.1 for quite some time (OK, a lot of time!), I recently released Planet Flip on the App Store: https://itunes.apple.com/app/id1120945024
It's a physics puzzle game where each level is split across 2 planets that each fill the screen. You need to guide our rather forgetful alien explorer, Bob, back to where he parked his spaceship (with his hazard lights on, of course). But you can only teleport him to the same position on the opposite planet, so you’ll need to carefully plan your route, flipping between planets as you go.
Later levels involve teleporting other objects such as giant space magnets (which really switch up the gameplay and puzzle-solving!) and even other rather spiky aliens.
Probably easiest to demo with the trailer video: https://youtu.be/iafsL5c6IZs
The core of the game was built in Cocos2D with Box2D for the physics, plus a range of indie tools: SpriteHelper, LevelHelper, ParticleDesigner, GlyphDesigner, TexturePacker and SpriteIlluminator.
I'd be happy to chat some more about the making of it if anyone's interested!