Thank you kindly, the detailed review is very very appreciated! I'll leave it to @snugglybunne to explain about the bass writing as much of the more detailed instrumental arrangement is hers.
For my part, I can respond re: piano since I played that stuff live: I find the insertion of chord extensions as being incidental to whatever the basic chord is, so I don't think twice about it until someone points it out. I'll be sure to give yours a good listen on my return home, especially from a pianist's lens.