Could use some mastering for clarity as in a lot of places it's very muddy and sounds quite muffled, especially in the piano segments. I quite like the choices in sounds and the songs flow. Good job, mate. :D

Wow. Really good! Some of the elements were a bit unclear, and the chordstacks could use some beefiness, but I think it's really cool! I think that if anything needs more work, the transitions could make the song more dramatic with the use of some silence.

About chordstacks... there's a really cool way to get awesome chordstacks with Serum, if you have it. I only have the demo, but it works really well. First, load up two instances of Serum. On one, turn on both the oscillators and just a bit of noise, then max out the unison on both of the oscillators. Then, turn the detune on oscillator A down a bit, and turn the octave up 1 on oscillator B. Then, compress it and highpass it after compression. You can do hyper if you want to. Then, go to the other instance of Serum, turn off the oscillator, and turn on the sub and a bit of noise. Finally, add full tube distortion and some multiband compression. It should sound sort of like a broken speaker. Then, using the first instance of Serum, get some chords down, and have the second instance of Serum just play the roots of the chords or whatever's convenient. I'll let you take care of the octaves.

The sound of that chordstack makes Massive, the synth, look small. No freakin' joke.

Hope that helps a bit!