im stuck on the centipede boss. when the centipede dude is low he goes in the back ground and does a massive kamehameha. what do i do?
If you're talking about the swinging laser, I recommend you take a closer look at the rocks falling and try to hide behind one.
Otherwise, If you're talking about the unavoidable attack at the end, it means that you've taken too much time to kill it, and you've reached the enrage, the boss deciding that he's done with you, essentially. ;)
I recommend either lowering the difficulty (the boss will have less HP), or be more aggressive and use the power punch mechanics with a maximum amount of stored damages. Good luck ! :)