That app looks excellent! I've looked for it before on the Android side and have seen it so far. Thinking about grabbing a used ipad just for that app. Looks like you can do most things without even turning on the TV.
15 years ago I would have paid $2000 to buy a hand held touch screen interface to play my music system. The stuff to dream of back then.
My advice to anyone using Kodi to play their music: Go buy the cheapest iPad and whack this app on there!