Good Basic Defense Game
The game had decent graphics, easy controls, and useful upgrades. However, the game was also sorely lacking some key components that can make or break a defense game:
1) The items were priced without any thought or consideration.
2) Each wave involved shooting the same enemies and had little variety.
3) There were no other purchasable weapons.
All in all, this is a good game and worth the time to play, but a little polish and shine would make this game great.