You know they're trying to monetize pretty hard when to progress at all, once must either grind terribly or just straight up pay.
The fact that the currency can only be collected once is pretty shady too.
Got the hard badge by using the minigun and farming for the homing missle guys. I think I had 6 homing missile guys, a few snipers, and the rest grenadiers and riflemen.
I just got the second ship (the Kogg) but can't seem to figure out how to get the next ship. I have plenty of money from trading but nothing to spend it on apparently.