EASY BOSS KILL: Stay on the top, long platform, and the boss will USUALLY fire a diagonal beam downward, which puts him in your range but doesn't come in contact with you. if his pattern changes (as in, it doesn't get in range of your weapon) just move back to the first platform until it resumes pattern. Keep bumped for those who need help!!
to kill the wizard, you need to shoot the yellow magic he fires at you until it hits his shield... then just wail on him.. he will regain his shield and then you must rinse and repeat