Good game and with improvements could be a lot better. First of all: The calculator is absolutely terrible! My maths is bad, but I'm pretty sure 893-100 = 318 isn't right. It makes the game very frustrating when you have actually earned enough money to buy an upgrade but it's not recognised. Secondly, it does get very slow later on and causes cars to crash which is annoying. Nevertheless, fix the bugs and this could be a great game.