The graphics and all around polish are great, it almost feels like a finished game (maybe with some chilled background music). There are only two negative aspects:

• the collision detection: it's not at all obvious sometimes whether you will hit a car or pedestriant
• the stars: it feels unfair to make a star not collectible because it's under a car when you pass by (allowing left/right movement may help with that)

Great stuff, don't think I could produce art that good even if I gave it an extra 5 hours. 

The design is amazing! Even the logo kicks ass 

Super fun and the visuals are amazing!