Well done
I really don't see the problem with this game. The difficulty curve was well done, starting out with the basic blow up farms to taking out defended cities. Really, the lack of an end of level upgrade system makes the difficulty curve work out, because the real challenge is starting out with lower energy and then building up to get the powerful weapons then leveling the whole area in one god-like swoop. If an end of level upgrade system existed, people would get to level five with enough energy to sustain a continuous super laser for the whole level. The fun is in going from simple bullets to other weapons, trying to get to the point where the weapons don't drain you anymore. The challenges were well executed and the game play was addictive and exciting. 10/10