This is a very creative take on a tower defense game! I really enjoyed the fact that you had to click to gain ammo, I felt it helped me remain engaged in the game.
When playing other tower defense games, my attention tends to wane after a while, due to the fact that once you have a good defense built up you really only have to watch the game go by without having to do anything. After I discovered that one of the towers you can get makes ammo for you, I was a little disappointed, but then enemies began to destroy my towers and my involvement was required again, which was a plus.
For a relatively small game, it makes a big impact in the content department!
Very well designed!
