The stage itself is just like any other. For the boss, follow this strategy for a quick victory:
Just Dash to the
right and under Gillwing. Now after you're under Gillwing(While still Dashing)
count about 3 seconds. As soon as that time passes. Fly up and make a U turn
and make a big Paraloop. That should get rid of at least 19 of his body parts.
credits: GiroroGochou