I tried Manifest today and it seems quite nice, with a cleaner and less cluttered design, but there are a couple of small things I would like to see fixed/improved.
The main issue I have is that the volume control can be too slow to get to. If you choose a new radio station and the music is a bit loud you have to first close the station selector panel at the top of the screen, then scroll down to the bottom of the screen to open the volume controller and then finally move the cursor back up to adjust the volume. If the music is too loud that’s an annoyingly long process. I would recommend a permanently open volume slider in all the main selection/playback views.
Secondly, for the desktop view, I would love to see the album artwork a little bigger and moved more towards the centre, with the text moved to the right and down, something like this:
It feels like there is too much dead space on the right with the current proportions.
Could be nice to have a little Volumio logo in the top left as well
Finally, a very small niggle, but the home icon is just a bit too small in the desktop view (when the icon is shown)