Goal is simple: drive as fast as you can without hitting any obstacles or falling off the platform.
There are blades, hammers, shooting devices, hydraulic press, spinning wooden planks that you should stay away. Wooden planks will throw you away but everything else will kill you.
Don't forget the goal. Drive as fast as you can, if you want to. Or else enjoy the journey. But if you want to challenge yourself, then try to finish faster than your current best time.