Nice composition man, most of the classy melodies were actually entertaining to listen.
The timing was perfect, you didn't rush to change so quickly (like I do, lol) from gloomy to totally uplifting and sometimes that works fine, and I liked the detail when you layer the xylophone with the synth pluck, like a sort of answer (1:38). The 'Rebirth' part was a total hype to listen with, just I wish the final beat was a bit longer.
As from my mixing point of view, you managed well to make the percussion stand out from all the arps, choirs and stuff at the electronic part (the thing I fail mostly) but my only complains are the sustained strings at 1:30, felt like it needs to be a bit more stereo; and the dirty high end of the bass.

I actually enjoyed the song, expect for that synth sounding ALL THE TIME like an ambulance siren is just annoying. I'm not anyone to tell others what to do but You could try instead a more melodic chord progression with a lush pad or the piano chords at 1:54. Cmon you got Nexus2, give it a good use!
The drop was good, that's a part where I would leave the 'ambulance siren', and the second drop was more convincing with the variety and sound design was good. Your wobbles and scream basses are killer!

First thing, everything sounds very dim to me... Like you seriously need to turn the highs all the way up. The 'neuro' bass has a lot of resonating frequencies I would cut. The synth with piano riff is actually cool. I also would turn up the stereo more in the higher frequency range and make it more mono the basses (especially the reese bass in the mid of the song).
Don't know if you tried to use MIDI notes for your Yamaha keyboard or you played it and record it yourself, in which case I have to congratulate you. I myself haven't done any song using my E363 yet.