Well I have to say. You get a lot for your money with this game.
Considering it's free you do actually get a lot. I think this is the way most games should go instead of charging money for what are basically demos. I did have a lot of fun. The graphics and atmosphere were also good. However, after an hour of play. It started to feel repetitive like most wave shooters. I think that's really its only real fault. It's a winner though and I will play it again.