I killed the boss using one of the bombs dropped by slain enemies. The mission did not advance. Perhaps there is a bug that causes the game to not recognize his demise?
I scored a 74 on the non-graduated scale. Without a frame of reference, this number is meaningless, however. Still, I think it good to have a high one, for I detest games like Golf.
Keep in mind you have to bust all three on the same level. I misread it and thought the same as Joanna. Also, patience is the key to the bonus levels. Figure out the pattern, and it's easy.
The inability to adjust the quality for computers that experience lag in sections hurts the score majorly, seeing as it is a game built around proper timing.