Added to faves.
Very good game- I liked the variety of enemies, the powerups, and the different towers available. Having a "hero" gives the game a bit more dynamic feel than if you were strictly limited to fixed-position towers.
There are a few things I noticed that could improve the game. First off, even though there is the small map in the corner of the screen, I would really like the capability to zoom out and see the whole field at once. I also don't really see what purpose the "power" serves, other than adding one more thing to keep track of and forcing me to build power stations (boring!) when I would rather be building towers (fun!). Also, maybe it is just personal preference, but I would really prefer not to have overlapping waves of enemies at the same time; it really detracts from the enjoyment when I can't even see half of what is going on (again, a full-screen view would help).
You obviously put a lot of thought into this game. Good job, and I hope the feedback was helpful.