Simple, and fun, with very polished graphics like all your works and amazing work by the composers.
Arkbrik nailed pretty much all the feedback you need. I would also add some sort of arrow or other indicator that shows you where the stone will land when you are about to throw it (think about the white dots on Angry Birds) would be really helpful too. And a small animation showing a close up of Little Red Hiding Hood trowing the stone the first time you do it would look great.