I really enjoy this mix. The atmosphere of it is really cool. The track has a solid groove. You use the source in a very tasteful manner. It does hold pretty close to the source. At the end it would be nice if you ended it differently. We already heard it played this way at 1:16. Give it a little variation. Also, try to end the song differently. It just suddenly stopped.
On the melody synth I feel like there should be some low pass filtering (or cutting high frequencies with EQ) going on. Sometimes the synth attacks hard and it sounds a bit ear piercing.
The panning drove me crazy on the percussion while listening to your mix on my headphones. I was trying to listen to the piano but I was drawn away to the percussion.