This was a great game! I think the only thing I didn't like about it was that it was hard to understand when I died. I was looking closely up at the thing at the top that said I had 570 out of something, but I lost when I only lost half my health or whatever that was. That doesn't take away from the fact that this is a wonderfully done game. I really like how it's a defence game that you have so much control over. You really get the oppurtunity to do everything yourself.
My advice is to aim really high. That way, you will get the ones that are highest up as well as the ones that are closer down when they hit the bottom. I came confused at some spots, like I thought the mine was something that was stopping my enemies from coming, but it was actually what my enemies were taking away! I appreciate the really high paced music. The overall graphics are great too.