Cocos2D Side Scroller Game

I'd like to create a side-scrolling game. I suggest to use cocos2d since it will be the easiest way to make this game, but you don't have to. If you want use other frameworks you can do that. What you have to do is the following: -A side scrolling game. There is a sprite (the hero) on a train which is moving left. The screen is scrolling into the right, so if you just wait on the train you will touch the left side of the screen and you will lose. Your goal is it to jump on the train to the right side (so the hero must move faster on the train than the train itself, so the hero can get forward). But there are obstacles on the train which doesn't makes it easier. At the end if you ran against a obstacles (lets say you ran into some barbed wire) there should be a game over screen with details about the run (how many meter, time, number of jumps). As obstacles i suggest barbed wire, just simple rectangles and bird. The hero(character) should jump, move forward and backward and roll(because he has to roll to avoid collision with the birds) Main Menu and Audio i make by my own, you would get this project from me then and you would have to work with this project to implement these features. Also i need graphics from you. I added a picture which shows what it could look like at the end (in the picture the obstacles and the roll option arent shown) I will give you a lot of time, so i think this is a good argument to lower the price. Also i think this is a very easy project for someone you knows cocos2d well. So just send me your offers. Thanks