01:15 is pretty much the only point where I'd say your mixing mastering was lacking. It felt kinda muddy and it was pretty tiring to listen to that part. I was going to say it's the sub bass, but the later parts that are similar for some reason don't share this problem. So make of that what you will.
This song kinda feels separated from it's own elements. Most of the time I keep thinking that this was originally just a piano solo instrumental, but then you slapped a dnb beat and a sub bass on to it. And while that can work just fine, I feel this song didn't really do that great. I'm also pretty sure that is not how the song was made, but that is just how it felt to me.
Also since the piano is such a huge part of this song, I would've really wanted hear more dynamics in it's playing, because at times it does really feel flat.
I have to admit my bias though, I'm generally not a fan of solo instrumental music (which again this song is not, but I can't get over the feeling that it is), so take all of this with a grain of salt.