woot beat apoclapytic difficulty with 4629m people and 25831 b cash and:
-11 ion cannons
-7 bunkers
-4 missle defense lasers
-15 missle complexes
also an important concept you need to understand to beat this game is that aliens shhot at areas that have less bunkers around them and thoes that are more upgraded. i suggest that starting out build 1 ion cannon, upgrade and then build 3 bunks around it. just before it dies build a ion cannon next to a bunk and the aliens will start shooting at that saving your best ion cannon. You should be able to figure out the rest from there.
5/5: personally, what i would like to see would be a fighter bay, just like the repair station except it launches four fighters to attack the pirates. You could up-grade fighters to carry either missles, pulse lasers, or both.
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Have fun with this one!