I've been playing 5 months (2.5 Dev) and have yet to see anything other than scouts, fighters and never more than 2 harvesters. I actually let the aliens get a strong enough foothold to launch an attack on my base, hoping maybe that way I'd finally see a Corrupter or a battleship. But no. They invaded with... another harvester. (good choice of craft... NOT)
Yet when I go into the data files, there's other craft out there. So... can anyone explain how the alien activity logic works? If "alien activity" has to be above 300 for something to happen, what is the 300? Days? Months? And presumably there's a way to tweak the gameplay slightly, so corrupters appear earlier... what would I have to change to bring on a proper invasion?