It's a good start and i like the retro feeling that it has (gameplay wise), but in its current state, i don't think that it's worth the 0.70€ that i had to pay for it. It should at least have some title screen or something. ATM, it throws you directly into the game. One glitch that i've notived is, that sometimes two cars are located at the same spot which looks pretty strange. Another annoyance is, that i had to uninstall the HelloWorld example to install the game. Are you using the same package/class name?
P.S.: I'll add it to the projects page if you don't mind.