I also recommend that you do something about the timer - either make the game automatically start with all people that have clicked on it, or make it wait to start until at least half the players have clicked 'ready'.
I HIGHLY recommend that in the next version, you don't give people points for racing on their own. WAY too much incentive for people to use the rooms on their own and not wait for anyone to join them, as they can just level up by hogging a room and racing over and over again.
It also might be nice if there was a way for people to loose points.
Cute squid (will we see more games with him in the future?), and I like the way each enemy is distinct in their behavior. Especially like the hampster.
Fun concept, poor execution. The score system could really use some work, and it would be nice to be able to whack the little sign carriers and the background people as well.