I really like your scenes kilinich, but i notice you never add anything to them. You made the most detailed and advanced car, but never added anything. I know you don't want to make them too hard, but after a few tries it becomes easy. I noticed you said you removed backthrust. It would be nice if you could make another version with it in to make it harder for us gamers. Even a parachute as previously asked to perform cool tricks. Anyway i rated 10.
These levels of yours are very fun, but I have a small suggestion. I think you should keep making these levels, but when you decide to make the final level you should make like a really long level, sorta like a marathon to end it, but thats if you do ever end it, which I hope you don't.