Apple Music support is absolutely on the roadmap, and so is iPad support!
If you haven't already, do send me an email. TestFlight is Apple's platform for doing beta testing, it's super straightforward.
Glad you answered the this point, I'm pretty keen to try any alternative to the white + bold/slab San serif wasteland that is the Apple Music app. The moment they went from one touch on the home screen, to several taps into a sub menu in order to "love" a track i knew the UX team went off the rails. So I'm keen to try new apps that support Apple music, but the majority are just shovelware or borderline malware.