Download button is too small. By UI guidelines buttons should be 44x44 to be hittable
When you connect and visualize music files in a cloud service, the whole “button” serves to play the song directly. There is a tiny arrow to download, but its area is so small, that you almost always hit to reproduce online. The arrow works fine, it’s just too small an area. If you re-visit that part, the rest of the app is simply the best with no real competition