I know I'm probably not in the intended age group for this, but a few things I think would really improve this: not having to start over automatically if you win and decide to 'play again' (didn't get the speed upgrade maxed out the first time), a bit more contrast with obstacles/colors as it's hard to really distinguish them, and maybe a bit more balance between the speed and the upgrades. In the end you just rush on, and it doesn't matter so much what you avoid or what you pick up, it's just an upgrade and reach the finish thing. You don't really have control over the bunny.
That said it was good fun for a while. Cute graphics for (I assume) a younger age group.
-cd-