Flute Sonata No. 1 in D major

Here is another chamber sonata in three movements, this time for flute and piano. Let me know what you think!

It does sound nice, but I'm not going to lie this isn't really my kind of style to listen to. However, that being said there were a few things I saw:

1. You use unison/octave passages a lot. Maybe that's okay for you, but personally I found it really distracting, since for me, I've been taught it sometimes halts development of a melody in favor of drawing attention to a passage. If you do this enough, there's not much to specifically have attention paid too; think of it like the Boy Who Cried Wolf.
2. I feel like there's too much of a distance between the piano and the flute. Sonatas should try to meld and intertwine the two parts together with melody transfer and stuff like that. It feels like the flute steals the show here. 

Other than that, it's pretty good. Keep on writing.

I agree. It sounds nice and the best for me is the solid structure of the whole (classically speaking). I think you treat this kind of works as if the solo instrument was a human voice. I don't know why but I believe arias are a strong point in you. True that in this kind of classic sonatas (focusing on Mozart, or Haydn), although the piano is not in the title, sometimes, of the work, it has an equal role to the solo instrument. As Monarcheon said, the piano and the flute can talk between them (repeating phrases, sharing them, etc....) Not always, but thiw would leave the piano in a better situation, more than a harmonic and rhythmic support.

Some phrases of the flute brought Mozart's Flute and Harp Concerto to my mind.