I think you did a good job of creating a real sense of ambience. It definitely fits the vibe too. Maybe the ostinato continues too perpetually throughout the track, but it's pretty good overall. The reverb pulls everything in well. It's also nicely composed.
I think that the harp could be mixed/have better dynamics, and some of the midi instruments get a bit grating and aren't mixed as well as some of the more droning instruments.
Overall, solid work. Good job!