Niiice!
I like the overall composition. You do a good job of keeping it from being repetitive, while maintaining the original yet continuously modified leitmotiv. It continues to entertain through the whole ride.
I'm liking a lot of your work, but you lack bass. This one's better than some others, but I think this and, specifically that "German Trance Yehh" one, could use some lower frequencies balancing out the squeaks. Tho, I kinda am a bass freak and thus biased on that note. Keep rocking however seems cool to you I guess.