Great piece of work!
With this i give it a hearty 9 and a big ass thumbs up.
Basically, this game is awesome and kept me entertained for 2 hours, then it kinda go bland once you start owning. For the first hour, it got me into it and basics were learnt. The game does take a bit to get used to and also to work out the engine. I think it needs a better game explanation or a good FAQ.
Another thing is that you should let the towers and trenches shoot in a specific range, not just on its line because that way it was very very painful to set up so many places. Especially later in the game. If you dont have enough defence, you end up breaking your finger buying ammo and clicking.
I also think you should create some soldiers and vechiles for yourself to use to patrol your area and shoot on command and if they walk into their Line of Sight/Fire.
But besides small problems, great game! Jus some improvements would be nice.