First iPhone Game in Development

I am in the process of developing my first iPhone game when time allows. Being my first, it is intended to be very simple. The basic goal so far is to drive a little vehicle over rough terrain and reach the end without flipping over. To avoid flipping you must tilt the device to either side which affects the vehicle's body angle. We may add a few other gameplay elements to make it more interesting as we move forward but we want to keep it simple.