Good but easy..
I conquered the whole map within 1 hour. >.> All I do is get enough money to buy diamond. Sell it in higher price. Lather, Rinse, Repeat. Then upgrade to a vanguard and buy down all the stuff giving me 70k each time.
Good:
Nice music(2)
Graphic(2)
Gameplay(3)
Bad:
Poorly scripted AI(1)
Glitches(1)
The vanguard glitch I mentioned. You shouldn't allow vessel skip. That'll do the trick(1)