there's a bug: try to position your cursor in the middle of the screen and wait... your score will climb up. after 3 digits, there's no more space to draw it.
awsome game! but i think i finished it. got 999 bullets for the minigun, i have 99 gunmen, 99 craftsmen and 99 silo workers. :) costs 146.520 per round. is there any ending btw?