Cave Runner Apple (Iphone App)

I am requesting someone could make me a addictive app kind of like how flappy bird was. I have this planned out, I was thinking something simple like a rubber ball rolling through a cave and there being spikes on the bottom and on top of the cave. As the player progesses through the cave i want it to gain speed to make it harder for the player. I also would like there to be a point system like flappy bird had but with coins. The Coins are for the player to select a custom ball they can use to run the cave with. I would like there to be a shop where the player can buy a special ball to run with. I was also wondering if i would have to supply the GFX work or could you? I guess we could find this out to whoever is going to make this app. If you have any questions feel free to ask me!