I've made apps that are very similar to this in the past. I will create the app for iPhones, iPads, and iPod touches. Will you provide the pictures for the objects, or would you like me to create them?
This is a very cool idea! I've proposed some milestones below. I will start by adding the jumping physics. I can tweak things like the height of the jump based on your feedback, so I'll be providing demos for you to try.
Next, I'll add the obstacles that the player has to avoid. Again, I can tweak how often they spawn, or how hard they are to get past. I'll send you a few tests, and you can let me know how you like them.
Lastly, I'll add the finishing touches to the game, like the user interface and Victory or Defeat screen.
That about covers everything. I hope to work with you soon!