TL;DR
I should probably apologize in advance; I'm kinda in a really picky mood tonight.
So about your flash: I've seen it done before many times, and with higher quality. It kinda bugged me how you couldn't run over the guy yelling at you for parking in his spot, or bash in the other cars around you to the point of blowing up. I also feel like the shopping cart is a good add-in, but doesn't really add too much in terms of gameplay.
Reading the review I just wrote, I realize how much the lack of realistic physics, as well as mayhem, bug me now. And that voting based on my opinion would be unfair to you.
But keep in mind that there is always room for improvement, for self satisfaction, and to satisfy picky people like me.