Kaze and the Wild Masks

Mother Mona is the boss of the worst world, and like the other bosses, uses a repeated pattern that can be learned or memorized.

You fight her in three different phases, with each following the same general order of attacks, but each phase uses slightly more difficult versions. More enemies running along the bottom of the screen, firing more spikes at you, etc.

Mother Mona's pattern is this

1) She moves to the side and launches spikes in whatever direction you are in
2) She strafes across the screen twice, while launching spikes straight downwards. There will be a larger gap between spikes at the end of each strafe. Follow her from side to side and utilize those larger gaps to not get caught.
3) Diagonal spikes again, same as attack #1
4) She will leave the screen, and the door at the base of one of the trees will glow blue. Spikeball enemies will come out of that door, in a set pattern, and move slowly across the ground. Simply jump over them as the come. After the enemies have passed, the other tree will glow and launch another set.
5) The boss returns in the center of the screen, and launches spikes diagonally downward to the left and right. They start at the edge of the stage and close in quickly. Stand in the center to stay safe.
6) She will smash down into the center of the ground. This will hurt you so run to either side. Then a column of fire will rise on either side of her, and platforms will pop out of the trees. Climb these, jump between the columns of fire, and jump or slam the top of her head.

That set of six attacks will cycle through three times, each cycle using slightly more difficult patterns than the last. I've also attached a video of myself doing a no-hit run of this boss as that is necessary for the full completion.