How to improve this app:

Retina Support
more Cars
more Parts
remove coin system
body parts (front, back, side, bumper)
animations
cool music (e.g NERO, chase&status, maybe nfs styled music?! OR EVEN BETTER: OWN MUSIC OR PLAYLIST!)
color selection plate for the cars!

alex93st about Car Builder Club - Free Cool Waterslide Coaster App, v1.0