"P-2 Final room trick (stalker): Once you only have cerbi and co left, stand on the top of the stained glass windows, nothing can hit you. Just +projectile boost to victory. Alternatively, skip the entire room by dashing after slam storing to the top. You can also punch the idols in the glass right now if you look at the right angle with a knucklebaster initial hit (extreme angle).

As for the lad himself, do not move in a straight line. If you do, he will beat you into the ♥♥♥♥♥♥♥ ground. Keep changing your slide angles after each hit misses and he won't be able to touch you."