This is absolutely amazing!

great vibe & concept, excellent work

My childhood movie!! one of the ghibli films that I liked!!

I am a sucker for mashups and cover songs.
You very carefully, and lovingly approached each character and found an aspect if their character to make shine in your rendition.
I suspect I could gush for a while, concerning things like your use of shadow, or the dull color tones evoking 1980/1990's anime shows, but I think I have one, much more simple thing to say:
"Thank you for making this."

I love you and this. Super cool to see this realized.

Also props to you for the color choice(s). Resembles Hayaos' well.