Impressive for 13 years old! :D
I have to say that I'm impressed to listen to a song made by a 13-year-old kid. I love the piano though, but you could soften it down a little bit more just to feel that the notes are constantly minimalistic-like. The chords, somehow, have a whole lot of extensions to them, but that doesn't matter much. :)
Try to deviate your drum pattern some more too.