In that case, congrats for having made a game! You've already come far by just attending to AND delivering a game here :D! So well done! Keep up the game designing, and please keep working on this game, I would love to see more polish :) Maybe the cars are something you can buy using the reources you gain from the buildings? Which will give you some other points each time the cars drive past something (just throwing ideas out here for you) :D