ive found that missiles on the first ship that you unlock as soo op once you get to the third level with overbooster i made it to lvl 50 which was like 20mins in? without moving at all. And if you combine that duel reaper and xp healing you unstoppable im currently 45mins in with this build and when you add piercing in the rockets damage go up to 5x if you max that out. TBH not really sure if this is op but im barely trying at lvl 58 on the first map...