honestly....ive won the game and spamming ANYTHING does not work....well actually spamming the Yamato with patrol boats works....trust me, all i did was shoot the yamatom with maine base artillery pieces and missile launchers from my fortress and so long as i spammed patrol boats, the Yamato fire only on them not the fortress, i won, and i only lost one missile turret and the fortress was barely scratched, copy this if it works for you.
on level 2 after you get past the waves of guys that keep coming and the blue error screens come up, i cant figure out how to jump up there, the guy wont jump high enough and there is no way to get a box up there?
 "Gray"){kind=icon}
 "Black Navy War"){kind=icon}
 "Morningstar"){kind=icon}
 "Now Boarding: Episode 1"){kind=icon}
 "Crush the Castle"){kind=icon}
 "Achilles"){kind=icon}
 "intrusion"){kind=icon}
 "Monsters' Den: Book of Dread"){kind=icon}
 "Castlewars"){kind=icon}