Just wanted to give a quick suggestion for the next patch since this seems not to work as intended design-wise.
I'm talking about the later stage of the mario boss fight where koopas are starting to fall from up above tossing hammers at you. The fight seems to have been designed to allow the player to kill the koopas by hopping on them. This works fine, however, it's extremely difficult in the current time window - it's so difficult to a point as to be actually less practical than if you were to just dodge ALL of the hammers. Kind of defeats the point of the method, and I also noticed how everyone does the dodging instead of trying at all to get rid of the koopas.
Here's how it looks:

The fireballs are clearly overlapping the falling koopa, and you just can't do much after they're gone since the hammer spam limits your movement drastically. I think the solution is simple, which is to introduce a small delay so that the koopas start falling down a moment later. That way you'll have more space to do the jump.
I think this fix is a necessity since the rest of the fight is relatively easy, and it takes a while for you to get to that point just to die immediately. It really isn't gratifying this way.