Hi
I have to say that, many times, I get bored with works written in strictly tonal language (it's a question of taste, nothing more). But other times I enjoy this kind of music very much. In fact I've been listening to it three times, just to tell you something I don't like or whatever. But I love it. The two main themes contrast very well and are beautiful. I think the piece is well organised. I never tell anything of things that, in my opinion, the composer has devised or determined.
I only have two suggestions: the score would be great if you would have written dynamics and slurs (which, in fact, they are played). The other issue is that, perhaps, the piece would sound even better with some modulation in the middle, or just in the last part to brighten the end of the piece.
Greetings!