Wasn't planning on commenting.. But..
Archeris, are you a complete idiot? How is this idea stolen from Xeno Tactic? If you would rate games based on that, you should give every defense game a low score because they were rip offs from the very first defense game.
Okay, lame comments aside; this game is mediocre. Although I did enjoy playing it, a few things could be improved. The first thing I noticed is lack of use for the other turrets/towers. I nearly beat all waves using only the 'normal' turret and creating a very long maze. You should put more emphasis into needing to use the other turrets.
Another thing that bugged me was lack of detail, I really enjoy seeing my turrets change shape and/or color after upgrading them. After upgrading, if you have a lot, it's particularly hard to find which are upgraded and which aren't.
-Will