(Kinda spoilers but not really...)
Yeah, the final boss of this game is fucked up (on normal at least, easy is a cakewalk I hear). I made it with the ship you get when you reach sector 5, destroyed his first form easily, then, he sent my ship into oblivion using his drone volley even though I stunned his drone bay with a ion bomb.
This second form is completly unfair. He takes at least 25% of your health everytime he throw extra drones at you and he does it every 30 seconds or so.
I hear he's even got a third form. Beating him with the first few ships seems impossible to me. What do you think?