Good, BUT...
I know it looks nice and all and has awesome graphics, but that's not what entirely makes the game. With so many defense games out there, it's hard to find any originality anymore. I liked the game, but the helicopters REALLY annoyed me. they only had to sit there for about 5 seconds and you would already have to heal your whole base. On top of that, MORE helicopters are coming along with tanks and infantry men. Either lower the helicopter's attack or increase the money you earn and I think this will be a great game. It has good physics and looks, but the idea is just not that new, and the gameplay is a bit too difficult for me. Maybe not for everyone, but that's just my opinion. Good job all around.