good game, but...
but it gets automated real quick.
at first it was real easy, then I had serious trouble stopping the planes from constantly pounding my tower, and after I got 3 flaks shooting real fast with many upgrades, basically I didn't have to do a thing. I just waited for the rocket tower to become affordable, and now the game is running in the background, the flaks hitting the fuckers out of the sky barely after they enter. maybe if difficulty would increase more drastically above, say, lvl 25, I'd have to pay more attention (or at least rebuild destroyed units :)
maybe new enemy fighters could appear (who start to shoot the tower alomst immediately, or they are really tough and hard to take down, etc.) this thingy ruins the game after level 20, really. or there could be some boss levels, with spaceships entering the scene, anything.
perhaps there will be another, improved submission? :) I would be looking forward to it...
Darth Pejka