Hey Bloop!
This looks awesome! You did an excellent job on this, and should totally be proud of how it turned out. Sorry I couldn't have helped more. Either way, this turned out really good!
I have two suggestions, both of which are up to you, but I feel would make this arrangement even better than it already is:
1. Maybe add some chords to the end of the song, just to liven it up? It feels a little bland, but that might just be me.
2. Chord markings. This is a complex song, and considering it's jazz, a performer would like to improvise within it. However, that is difficult in such a strange key, especially without chord markings. It's up to you, but I feel that some chord notation would compliment this song nicely.
Thanks for doing such an excellent job fulfilling my song request!

EDIT - Also, it looks like you're missing a composer, haha.