How do you think it should be changed?
I summarised the things that come to my mind when using Panel:
1. landing page (Panel) looks nice with the background
2. all other pages look different from the landing page, why not consistent in some way (font, layout, ...) like the settings page?
3. bad looking icons (Album, Artist, Home Icon in the top left...) (see 2)
4. no information about what is currently playing, why not reserving space on top/bottom for playback information (artist, movie, album, duration, ...), maybe even customizable like the info screen on top in MC
5. when browsing albums, it seems there are only so many on one page. why is it necessary to skip "pages" in order to see all albums? they should really be on one page.
6. in tracklist view only titles are shown. why do you not use the remaining space for showing additional information? you could even add links to allmusic, discogs or whatsoever (maybe Panel could read out the metadata of the files played?). this might have potential to be a roon-like interface (with regard to the artist information shown to the user)
7. why is there no easy way to go back to "what is playing now"? i always need to click on "home" in the top left corner. why not make a control panel "sticky" (forward, backwards, volume, ...). maybe together with 4.
8. the volume slider could be worked on (if possible): when dragging it, the latency for the volume to change is quite high,
maybe it even changes the volume first when you release the slider?
9. it would be nice to have resizable artwork (maybe like in MC). please take 5 into consideration with this.
10. the possibility of using a tree-like structure next to the usage of icons now implemented for browsing through functions and media might be welcomed by some users
11. why do i need to go through genre or year when browsing (a manually added view in MC) in order to get to the movies? there should probably be options on how browsing through media levels should behave.
12. why is flash player used for video playback? I understand this is a "legacy" technology?
13. more control when playing back video (subtitles, audio stream, ...) would probably benefit the ux
14. why don't you rename the description of the wdm driver from IPC to something like "MC audio" or something not so cryptic.
This definitely has potential, I like the approach but a lot has to be done still (I'm talking exclusively on audio/video functionalities as I do not use the other parts).
EDIT: included 14.