Nice work! Sold all round effort, I played it right through. I liked the themed levels and the unique characteristic each had. I found I could skip through the levels a little too easily by getting to top speed, jumping and then at the peak of a jump hitting boost. I just repeated that and the my runs were almost infallible.
The only thing that confused me was that after I dropped the package off I wasn't sure that I was meant to go back to the start. I kept trying to jump over the police or hide under the cover of the house I dropped it off to. Perhaps an indicator to hint where to go like Golden Axe (and other beat 'em ups) did with GO! or similar would work well.
Anyways, great work, I had fun!