Mvt I - You do seem to love Sonata-allegro form I notice. While the intros to your piano sonata worked, this one doesn't. It just seems to build to nothing and is overly dissonant to no end. The themes you have in this piece are all very enjoyable, and on the whole, I had a delightful romp here. The development section was sufficiently interesting both harmonically and emotionally.
Mvt II - This was very nice and quite lovely, though you used some dissonance throughout the piece that seemed to mar the beauty of it, as it didn't seem to serve any purpose. The short fast paced section started out being very interesting, but it just dwindled out of existence. I felt cheated by that. And the ending was uninteresting, it just sort of dies out. Is that what you meant to do here?
Mvt III - I must confess that I did not particularly enjoy the A material. The constant trilling kind of annoyed me for some reason. If elt it was overdone. The B material was lovely and I whs you had used more of it! The ending was quite unfulfilling to me though. I think there could have been far more done with this.
You have a great first movement, but it is saddled by two other movements of lesser quality.