Wow, this one's long. Sorry for taking so long to review this btw, just haven't used NG much recently ;(
Let's begin with the goods:
I love the Porter Robinson feel this song has. It truly feels like a journey through another world. The section at 2:53 is really interesting. I especially love the bass, it sounds so analog. 3:24 is pretty good as well in my opinion, and it sounds unknown and mysterious in a way.
On 4:26, there goes that lovely bass transition again, and it is just as good. I like how after this, it goes back to the drop slightly different, then goes back to the intro.
6:06 is really good, although I feel like it needs tighter reverb.
The outro is really good, I wouldn't change much at all there honestly.
Now for the change I would make:
I feel that generally, you want to use reverb carefully, because if you mess up the reverb, the whole mix will start sounding like stuff is clashing together. First thing's first, I noticed you put reverb on the really nice bass you used.
Here what I would make sure to do is cut the reverb's lows (from what I know of SunVox, you can do this by connecting your synth to both the output and the reverb, but connecting the reverb to an equalizer with high and middle active and connect that equalizer to the output).
Do this for EVERYTHING. Reverb instantly turns your synth's signal into stereo mode, so if you don't equalize it with the required amount of care, it'll stereo the bass frequencies and ruin the mix.
Also, one more tip, equalize the low frequencies out of everything except for the bass, sub and kick. Do this carefully.
Anyways, that's all I had to say really.
TL;DR - This song is fantastic, but the mixing is limiting its quality.
Can't wait for your next projects! (There are probably a few I missed, but ykwim.)
~SpeedoRH