Forbear with me let me review your music as I heard it played along sequentially with time.
1. The intro with the 'concerto-like piano' sounded so perfect and nice to the ears because you played it how it was supposed to be played!
2. But the next voice effect, which sounded like an 'alto sax' that followed immediately after the piano, didn't go down well with me for two reasons: firstly, I was expecting to hear a 'string-like voice' effect after the 'concerto piano',so I was disappointed; moreover the sax seemed so empty without a covering background of string. Secondly, the role the 'alto-like sax' was assigned to play wasn't too befitting at that stage at all... the skating scale-like solo it was doing should had been more befitting for a piano or brass string or any voice effect that have a sharp cut-off frequency (that doesn't sustain).
3. But when the song played for about 55% of the time, upward, all the right instruments were used and they sounded so wonderful. The bass guitar sounded so wonderful and should have been a little bit louder. I love the piano that played next; I love the rock-like guitar solo also that came soon afterward... after the piano raised the speed level, and the rock guitar stirred up all the emotions and noise-level... any other voice effect that played afterward (like another sax you used) simply sounded wonderful.
I hope my review wasn't to bulky... I only stated my personal observations which might not be another man's opinion.