I really liked the idea of a bullet-hell tower defense. The game gets very intense the more you progress and buy towers. But, a known tactic, caving in between 2 blockades, or 1, really makes gameplay a little too easy (of course, if your urge to get materials doesn't overtake you). I think a small (as in really small) system wherein the player has to get resources in order to pay bills, etc. or having more robots would, in my opinion, make this game better.
