Build an iPhone game app -- 2

I want to create a game involving a maze. The objective is to find your way out however as easy as it may sound the exits of the maze constantly change at random times. Also you can have power ups witch can teleport you to somewhere else on the maze and you can collect tokens etc for powers. To make the game more challenging we could also have a timer witch tells you how long you've got left to exit the maze (but as it is constantly changing this will be difficult) and if you don't get out in time all your tokens go back to zero. If you do get out you will then move onto the next level containing a completely different type of maze with different features and power ups. You would need to tilt your phone to control the ball. I would like a total of 5 levels in total but I want this to be a continuous game so the first maze should be quite challenging so users don't think this is the type of game that can be completed in a few days. If any developer is up for the challenge contact me and we can discuss prices and anything else. *Despite the description I would like this to be very very simple as I am planning to do most of it myself however I would like something good to start with.