Interesting note: Midosu is one of the few bosses (possibly the only on) that you can run away from! I initially wanted to fight these guys underwater (no, I'm not insane), but the fight dragged on for quite some time and I just left the room. Of course, when you come back, they've mysteriously healed. 0_o The attack of my Drill Arm is only upgraded once, which is why it's not doing God-like damage.