although I'm a rock and metal guitar player (and will remain !), I also love playing classical music on a nylon string guitar. One of my favourite piece is "Recuerdos de la Alhambra". I love Beethoven.
You ought to try and find the String Quartet tribute albums. There's tributes to Metallica, Guns 'n' Roses, Red Hot Chilli Peppers and shitloads of other bands.
You played that music? Great. I'm not an expert but it seems to me that the main part (more happier part) that reminds me old Chaplin films, could go faster and with more dynamics in rhythm. Some notes you play arrive too close to others. Try to maintain rhythm specially when you switch from each part of the music. This is my opinion hearing that mid file, it would be better a real piano sound to evaluate.
Do you agree with my opinion?
Chopin, Schubert, Dvorak, Mozart, ... great !!!