Sounds great!
It sounds like you a lot of thought into the composition of the song; the notes sounds well thought out. The instrumentation is also good, but one thing that came to mind is that considering the "plot" of the song, shouldn't there be more of a buildup or noticeable shift in melody/harmony/volume? Right now the melody/volume/harmony stays at the same stage the whole song, which doesn't lead to any buildup or a feeling of two distinct emotions. Not that what's there is badly structured or even close to that. It's just that it doesn't quite feel like slowly building rage and instead just feels like a mix of the two, rather than a "transformation" as you put it. You did nail the "mix" of emotions, though.
This is all just opinion, though, so you may get a different reception from somebody else.
Also, one question: did you record an acoustic piano or create a piano instrument in your DAW?
Not bad, I enjoyed listening to it!
