Great prototype, really fun. 90 % of the time I play racing games; but recently I was addicted to "20 minutes till dawn". Hehe, ... a survival game with cars - I love it :)
The only thing that bugged me a bit was the selection of the perks via mouse. From experience I know that most racing game players use both hands for driving -- usually left hand for accellerating/braking and right hand for steering. Ever so often I lost a heart after I had selected a perk because I was not quick enough to get my fingers back on the arrow keys. Maybe it would be good to have a one second pause after the perks menu closes.