Since this is three pieces combined and not one individual work, I will avoid comments on the music itself, but any other aspect I can find.
1) Your first transition was ok, but I think if you wanted to combine them freely, I would've used a long note in the Piano, and start the left hand accompaniment under it. That's just me, but I think what you did will work.
2) I like your development. You really play around with the notes that you have already.
3) Cromatic scales are overrated. Is it possible that you can just use a major scale, or even a seven or other odd chord arpeggio in place of it? I think the chromatic scale is an OK way to get to the recapitulation, but it is a bit stereotypical... and yet it IS very sonata-y.
Pretty piece! I liked it. Remember, everything I have posted is just food for thought. You can either ignore everything, or use ALL of my suggestions, just don't feel obliged to.
