Thanks for the feedback.
I like your track too...nice chill vibe and the piano sits nicely in the mix.
If I had to give an area where it could be improved I'd say to switch the beat up around the 1:50 mark. It sounds like that's where the second chorus would come in right?
So i'd try to add a new element to it at that point, either by adding more percussion or changing the pattern a bit.
You could also add a harmony (maybe an electric guitar sitting behind the piano would be nice).
Again around the 3:17 mark i'd change it up every so slightly. I don't mean it has to suddenly change direction, but it needs something.