Great mix and very good range of frequencies to my ears, one of the most well balanced tracks I listened till now. I am a sucker for flutes, so you got me totally hooked by it from the start. I also dig the "loop" nature of the track, coming back to the beginning, and always find interesting those pieces which try to build on the previous material presented, with little variations but timbre. In this regard, I think choosing to keep a drone sequence of the same repeated note is bold but also risky. At some moments it is really effective to create tension and play with other melodies, but at some points I must say it can also get too much attention (this could be due to my ears or my headphones having an affinity for that frequency, though, so take this with a grain of salt). A fantastic piece which I really enjoyed and fits really well to the mystery mood you were aiming for. Good job!