Nice take on the theme and pretty addictive gameplay! Really enjoyed planning my defenses and then watching them go to work.
A fast-forward option would have been nice. A lot of tower defense games add that to help with the "downtime" of just watching your towers. The audio effects were good but would have liked some audio for the missile impacts as well. And I didn't really understand how the laser tower was supposed to help if they only shot their own moon :(
Overall great game! I could see this being a great mobile game, very simple controls but very addictive gameplay.