Add a "sticky side bar" menu
I love Loopy's simple and clutter-free interface. But sometimes I wish I didn't have to continually swipe through the side bar menu to go from one set of functions to another. It would be nice if I could select one of those menus to persist on the screen, perhaps on the other side from the regular side bar.
That way there would be two side bars, one on each side. One of them would be a fixed side bar of your choice (say, the playback controls). The other side would be the regular side bar swipe menu minus the selected function (say, the playback controls would be missing from this to avoid redundancy)
I think that would help keep the screen clutter free, but allow the user some flexibility in persisting a particular function of choice on the screen.