Wow... now this is something.
This is really a very special work. It was very touching for me, reminds me of how my life is running now, except I'm not making tons of money therefore I can't afford my own instrument (sniff).
The story is very hummble, but especially the theme, even if used too much lately, remains being a good one.
The music is pretty well made, fits well with the whole.
Your backgrounds really improved, but definitely you should try more colors per character, even if you have the intention to "divide" types of characters with them.
The pace of the film is really good, although I didn't quite felt the "elephant in the room" thing, like I couldn't understand it.
Anyway, its a very awesome film, no need to add voices, good choice of bright colors, good music; so keep it up, always up.