Thanks for the feedback, I'll check out the car section. Perhaps there's a weird bug going on there. I think I'll add a quick UI title at the beginning of each stage to give it a more cohesive feel when you're changing levels.
Shoot, I thought I had fixed the screen size. I'll go in and take a look again. Thanks for letting me know.
Edit: forgot to answer. There are 5 main levels. There's one that's kind of hidden (hint: requires you to go down instead of up. I wanted to have about 10 levels total, however I ran out of time building the core pieces. Looking to add new levels when I have a little time.