Although really well done, as in sounding very professional and mixed together perfectly, I think it was missing a certain layer of depth. At around 2:45 this is fixed a little bit, when the high pitched sound comes in. The more bass sounds needed to come out a little bit more too. And despite it being an ambient track, I think it needed a certain level of growth throughout the song. You can notice this by jumping at 30s intervals. Once you get past the halfway point of the song this starts to come in, but I think if it was stronger, it would be a much better way to progress throughout the song. Regardless, don't take this as this isn't great work. Keep this up, and you'll be fine.