At first I thought the waveform was the default one that Soundcloud puts on tracks sometimes. The fact that it is the real waveform is super neat!
I like the atmosphere you built and the notes that play are nice but I think its missing something. If this were part of a larger set of songs then I think this would be great but on its own as an individual song it feels really basic.
In general I think that either having a second track with more variance or finding a way to add more variance to this track would benefit it a lot.