Amazing!
It was fun to say the least. try to make it harder. By level 30 i didnt have to do anything. the auto defence took caer of it all. It would be sweet if the tanks actually fired before they got to the wall... same with the men, bikes, and rocket launcher.
Try making things more expensive, or the cash you get from killing things less. Also put limits to the number of people you can have in your base. have them die so you can replace them too. Its not really fun if it isnt a challenge.
Great game though! hope to see some changes;)!