very enjoyable overall. some comments: i played until the end just to see what sound the great one would make when i popped it (because all the other circles made cool sounds) and i was kind of disappointed. also the process of killing the boss is easy yet takes a long time if you max out on everything else, it would be nice to have a more interesting mechanism that maybe doesn't take as long. (e.g. roomba and rocket seem not to affect the boss? which was sort of disappointing) it would also be cool to be able to upgrade the roomba and rocket once you max out on your own turret.