Rage-o-meter

Working on a project for college - basically we have to design game, I chose to design mine for the iphone/touch

The idea of my game is basically you are escaping from prison...and you have to jump over the obstacles in your way - a lot like Canbalt

I spent an hour or so mocking this up, and think it's prety cool for my first attempt at designing for mobile, and games as a whole would love some pointers :)

*note, the game won't ever actually be made - atleast not for my collage project, just need to design the levels, work out controls, game mechanics...etc

Thanks!