Could have been better
So the graphics are nice and gameplay is smooth but this game isn't all that original aside from the fact that you're trying to destroy something rather than protect it. However, you're still only one guy attacking something; not an army. In other defense game armies attack you. If you really want to make this a reversal/twist on the genre, you should make it so you can control multiple units attacking the base. Or better yet, make it available for multiplayer co-op so up to, like, eight people at once can attack the base. Now THAT would be interesting! All in all not too shabby, but has a lot of room for improvement.