The production of the piano was decent, though, to me, it's lacking. The sequencing sounded mechanical, but the soundscape is airy enough where that issue was mitigated some; to me, the timing of the piano chords shouldn't sound so blocky.
From :48-1:36 & 2:00-3:00, the countermelody essentially became drowned out; while it wasn't a dealbreaker issue on its own, it's an issue for most of the song. This could use some volume and balance tweaks to ensure the countermelody isn't washed out by the other sounds in play. Just for clarification, I see your notes about feeling the encoding may have reduced the quality, but I don't believe 320kbps vs. 192kbps or VBR1 would be a factor in the critique.
Melodically, this could have taken more risks, but the overall sound of this was decently personalized. By 1:36, the track was feeling repetitive; some sort of dynamic contrast through different instrumentation or textures would help. Right now, there's a gradual escalation through the additional padding/vox over time, but the overall flow of this piece still comes across as too static. 2:35's synth-led section was something new for a few seconds before the finish, but there's the potential for more. Watch the cut-off ending as well, that's just an needless error that should be corrected. Keep at it, Alexandre; you show potential with this one and it's clear you have the right ideas in mind as far as giving a track your own personalized, expansive sound. NO (resubmit)