A great small game, with a polished feel. Graphics, lighting and general look of the game are really good. I liked the intro graphics. Music was very fitting. The UI works well, I like the bounce and twisting in the UI : gave it a lot of juice.
The highscore was icing on the cake, but a great touch to keep me/us playing.
I noticed the cars went around my world ball once, do they have their own smarts to go round the ball? When there is a crashed car in front of them they seem to just line up behind.
As feedback I'd say, it would be nice if the ball was bouncier when hitting houses. When I threw it at a house, the house seemed to absorb the energy rather than bounce the ball back. Perhaps the buildings and the balls bounciness could be something that varies per world/level.
In a future version, it'd be cool to see different vehicles on the road, providing different size targets and giving different scores when hit. Perhaps even a hovering helicopter.