Hi / Hola.
I like the piece, and how it begins with that ostinato, and the way it develops from measure 8. Although I'm not very fond of those harmonic changes in m. 13-16, they sound "standard".
The middle section (Allegro con affetto) is beautiful but its style is very different, it seems you go back in time from something "modern" to something romantic. That's a bit confusing for me, as a listener.