Beautifully Addictive.
I'm not a "defense game" kind of guy, but this game is terrific. The graphics are some of the best I've seen on Newgrounds, and the gameplay is smooth as can be. I may be nitpicking here, but the only "problem" this game has is there's very few powerups. It'd be awesome if you could add in more powerups, and/or you could obtain $ while completing each level, so you could buy the powerups.
Anyways, with a overall stunning look and pitch perfect gameplay for a defense game, this is a solid 8/10.