Transitions maybe too abrupt. It's definitely creative enough though. We almost all of us took a credibility hit because we used real instruments instead of base chip tunes, got to think of stone age 1985 technology for electronic music. I liked it but maybe a little more coordination (granting that jazz is about chaos but very first original SMB is a cutie-pie game and not really darker).
If you do rate my submission back the actual correct wav file and soundcloud link are out on this page:
https://exedexes1.itch.io/smb1-underground
i ran afoul of the issue where if you don't move any of the defaults it submits the prior project by accident