How much theory do you have?
The other guy is right, most of your statements on classical music are completely false. Melody is the MOST important thing in ANY genre, ESPECIALLY classical. You do a good job with creating a dissonant harmonic line for the piano, but melody is required in classical forms. This should be a Sonata-allegro, as the first movement of a concerto, and with no melody, one cannot make out any sections.
I am tempted to respond either with an attempt to communicate how awful this review made me feel, or angry declamations againt you. But that won't help anything. I remind myself that Newgrounds is not a bastion of thoughtful reviewers. I cannot believe anyone writing a review like this has thought about it, or considered the emotions of the composer. I hesitate to ascribe it to jealousy, but I know this piece is far better than you have made it out to be.
True, he did not give any advice, but he still makes a good point.
To begin with, classical music is the least melodic of the general genres. Melody is not a concern of mine. That aside, there is not just one, but several melodies in this piece.
In the Classical and Romantic styles, songs should have one main theme, and a secondary theme.
"Just a bunch of arpeggios" was published in a review as a critique of one of Rachmaninoff's concertos, and I've always found those rather good. What do you make of the chordal section, the violin break, the string interlude, and the tutti chords, in light of your arpeggio-based view?
You are not Rachmaninoff. Regardless of whether you may be his successor in the future, Rachmaninoff still followed melodic rules, etc. and stayed true to the classical form.
A agree with your stand on piano concertos, however.
This is a nice little piece, but it could still use work. Just study classical form more and work on bringing out melodies a little stronger.