That's a good question, I have to admit there are a lot of similar softwares available these days.
I noticed that I tend to always listen to the same music, and sadly I even forget the music I have.
That's why I tried to put as many links as I can in the interface to easily jump from a title/release/artist/albumartist/genre/whatevercustomtag to another one. In particular, it should handle (custom) tags with multiple values, and it can filter over some of them on all views.
I also tried to make a recommendation engine that makes use of a SOM (https://en.wikipedia.org/wiki/Self-organizing_map). For that it fetches data from AcousticBrainz (https://acousticbrainz.org/) and makes clusters of songs that have similar audio characteristics. I have to say it's not perfect (it's quite good to cluster metal tracks though), but I would like to go deeper into this subject.
Apart from that, it is really lightweight and that was not really the case of the avalaible softwares when I started it.
What's been your rationale for building it, what does it better than the rest?