Some special attacks, but: You have to stay at the RIGHT !

Mega Man:       D,DL,L+Y
                D,D+B
                U,U
Bass:           R,D,DL+Y
                R,R+Y (when you jump)
                U,U

D is DOWN, DL is DOWN-LEFT, U is UP, R is RIGHT and B and Y are the buttons.

On the stage select screen highlight Shademan stage then hold B to hear a tune
from a classic game, now have to fight against other enemies...