Hi Rodrigo, I quite liked this piece. Some comments regarding each movement (seeing as they all have a distinct quality):
The first movement has a strong sense of unity. Really great writing here. Musically I thought the Allegro assai was a little weak compared to the superb other movements. The second movement I liked because of its harmonies (they have a sort of longing feeling to them), the constant struggle between minor and major. The third movement was a great stormy movement, probably my favorite movement of the piece. The fourth movement seemed off at first, I had suspected a fast last movement. But it actually works very well. Melodically I think this is the strongest movement.
Overall, nice job! If there is an overarching critical note I could make, I'd say I don't feel the four movements are connected very much. Maybe this was by design, and it's not incorrect, but I personally like a piece to be one story, regardless of multiple movements.