Thanks for the kind words, we appreciate it!
We currently have two working solutions for Spotify. The Connect plugin that requires a login and the LMS plugin Spotty which requires one authentification login only. Here is the discussion on the latter: https://www.max2play.com/en/forums/topic/new-hope-for-spotify-lms-plugin/
This is the repository you need to add to your LMS (Settings -> Plugins -> below): http://www.herger.net/slim-plugins/test.xml