Wow
A defence game I'm actually very impressed with. None of that stupid magic power up temp crud msot of the others have. I actually found the increase in cost of the items as each was bought rather interesting as well as not being able to just focus all into one weapon. I definately wont complain about it being hard. That was crazy but fun. The diversity of the units was awsome.
Suggestions for future versions:
-I wouldn't mind seeing a slightly wider visual area to work with, the large arcraft though easy to shoot down usually get in a few hits before they could be dealt with since their size puts them in shooting range almsot imediately.
-More units
-More upgrading (both side)
-Weapon advancements to attach on all four sides (Sort of an iffy idea, probably too powerful)