Thoughts...
I like this game a lot. It's got addictive potential.
HOWEVER! I have two quibbles. Needs...
1. More stunts- I think you should get some money for doing front flips as well as back flips. Otherwise you can't really get money for stuntS, hmm?
2. The ability to add or remove bought items- The helicopter annoys me because it seems to be useless (correct me if you replay it and decide that I'm wrong.) I first thought it would give me more height...but I got the same amount of flips. If anything, the propeller caused me to hit the ground sooner. Then I thought it might get me farther...nope. But I can't get rid of it, so that's a fat lot of help.
I'll favorite this so as to keep track of any modifications in the future. I do like the concept and effort. And the brain leakage. :)