ok, i played through the whole damn thing, so you did good.
graphics, music and artwork are all well executed.
the tecnical parts also seems to be very good. no lag, short loadtime, good controls.
this kind of game is nothing new to me or the internet so at this point i'd give 4/5 (because with a concept that has been around for so long, 5 points are just out of reach)
the upgrades feel kinda off. you get so much money for the first completion of a level that your position doesnt matter at all...
and the best vehicle is the supply truck. really? thats anticlimatic
also, you advertised you game as "fast paced" when in reality most of the tracks are rather slow climbing courses... (i actually got a little exited when i read "fast paced")