Great game, two gripes.
I have very few gripes about this wonderful game. Two, in fact.
1: Since there are only 20 levels, by the time you get the last sniper rifle, which is alot of fun to play with, you only get to use it once or twice - very disappointing. In a defense game like this, you could easily stretch it out to 100 levels, or simply endless, until you die.
2: The aiming is a bit off - you have to aim a little lower than you want to hit, making it very difficult to get precision head shots, which become important pretty quickly. I have taken to simply shooting the army soldiers in the legs, since I can't hit their faces...
Other than that, fantastic, and I'm still giving it an overall of 10, and I plan to give it a 5 rating every day. Make sure to keep these coming!
(I'm giving ita humor rating of 10 because of the notes.)