This was amazing!! The first couple of rounds, I was thinking this was way too hard. Then I figured out which items to upgrade first. After that, I was off to the races. This was awesome. I built a super destructo tank and I started hunting the other tanks instead of them hunting me! This went way above and beyond all my expectations. Great job!
Quick note: When I won, the screen faded to black and then nothing happened.
Here are a couple of screenshots I took while playing. 
