Nicely done! I tried Easy and I scored about seven first trial so there is still room for me to get better at it
So yes, agree - splendid work on the AI!
Might also be that my xperia mini does not support multi-touch, hence couldn't slide and jump simultaneously.
Could not find any obvious bugs, but one thing that is a bit annoying is that one have to go back, back, back through the main menu in order to exit. It should exit immediately (or close to it) when pushing the phones back button.
Good work on the graphics too, and if you want a challenge I dare you to have a quick look at the parallax example for e.g. the clouds.