Game graphic goodness

I haven't been posting here for a while, as I'm working on a my CS degree, in fact I've just started the final project, in which I'm planning to investigate cross platform mobile app (game) development.
I'm looking at a number of different cross platform frameworks, like Cocos2D-X, and aim to see how easy it is to maintain one central code base, whilst porting apps to Android and iOS.
To do this I thought I'd build a simple "infinite runner" or "platformer" using the characters I designed for the Ninja Dinosaur vs Pirate Robot book.