This kicked butts
Graphics, I loved the marks when you turned and the cars and the characters themselves, but the background was pretty dull. Add shadows or something.
Style, Alot of style right there. You redefined the words "90-degree" by your unique style which is putting them everywhere, and with the line not counting laps but how much time you pass over it (which makes you do 200 circles instead of doing the whole track), you've got a great nascar game.
Sound, the music was awesome, engines roared like wild beasts. No seriously, the music was awesome, what is it?
Overall, great game engine but add sounds, improve graphics,fix the line and add tracks (which don't only have 90-turns" and you've got a great game that'll be worth twice the score you have now.