Fun, but...
You know, when I first saw this appear on the Daily Top Five I thought "Yuss, Age of War 2 is finally out." But once I started to play, my anticipation turned to disappointment.
There really should have been something more to the game. Essentially, it's just a rehashed version of Age of War with better graphics, the option to upgrade, and a "2" stuck on the end of it. You say the "twist" of the game is that you evolve as you play, but all evolving does is change what the units look like (and make them slightly more powerful). This means at the end of the day you're playing as super-advanced cyborgs and the like, yet you still have the same type of units - support, infantry, etc. - with the same strengths and weaknesses as the intial ones. The game is just increased at a constant scale. Also, the XP and upgrade system isn't very good either.
Overall, it's not really bad, but it's not the best. I think it could've been a lot better.