I have just made a video to show what happen when you collect all 120 stars. It's a big spoiler so don't watch it if you are going to buy this game
http://it.youtube.com/watch?v=snTg8QYmXoc
http://it.youtube.com/watch?v=Z1A8n2j0Iio
http://it.youtube.com/watch?v=ktRyJz060tg...