Nice trip hop feeling! I really like your beat. I think it´s pretty well mixed, although the piano sounds a bit too dry. But maybe that´s because I just mixed a track with way too much reverb. Around 1:29 the drums suddenly are very quiet. I would increase the volume a bit (except for the louder cymbal crash, which is already loud enough).

The piano melody is nice at the beginning but I have the feeling it doesn´t really go anywhere. I think you should decide in this case: Do you want to make a completely ambient like track? In this case your melody is way too much in the focus and gets way too much attention. If you want a more melodic piece, you should develop the melody. Vary it a bit. Use some different chords once and a while. As I said, if you are going for a more ambient piece it´s fine if you don´t vary that much.

You did I nice work here with the stereo placement. Sounds very roomy. One last thing for the piano: It could need a bit more humanizing. Some velocity editing can help to give your piano sound a lot more feeling.

All in all this is definitely a nice relaxing track to hear.