Seen these kind before
You have impressed this reviewer with this one, I found this thrilling at times and overall it was fun, Must have been great to finish this one, anyways you have made something here that everyone can enjoy. These games i have seen before and these can get pretty addictive just like this one now, now as i got into the game its pretty fun and its all a learning process as you findout new things and how to progress, the first challenge seems to be slightly harder then i thought, but overall this is a fun and addictive game. Even though the some of this review is critisism, don't take this as a negative review. The Flash is awesome, but can be much more awesome in my opinion. You really deserve more credit because i do know from experience that these take lots of time and effort.
~~THINGS TO IMPROVE ON~~
So always doing what i can to get some new and some improving ideas across the way here, I believe you have covered alot of things already and did some good detail here, allthough there are still some ideas and areas that could be added, and here is what i thought and came up with. With this kind of game i wouldnt mind a larger view screen so that you can have a larger maping out of track and such.