Last boss is frustrating at first, but not actually that hard. Remember, you're an indestructotank! Get into the laser beam, and when it's done, glide down into the window. Only takes 3 or 4 times.
cool game, great ending. really liked the blood-splatter-as-health-meter concept. sure, it takes a while to unlock doors, but that just gives you a chance to play with all the awesome toys!