My favourite feature is Physics!!!!
My video is a tutorial to create a Angry Birds Space mechanics using C2:
Part 1: http://www.youtube.com/watch?v=8xJspxX5PTM
Part 2: http://www.youtube.com/watch?v=FQG1TwDQPQE
As a added bonus, I exported the game to my Samsung Galaxy Notes using CocoonJS, is at the end of the second video.
English is not my first language, so I hope you understand what I try to say :)
Good luck to all participants!