Some pointers.
I've got nothing major to say about this song. Everything fits together perfectly, creating a very smooth track.
So pardon me, but I'm going to go very nitpicky on you.
0:18, the 16th note lowish lead is either too loud, or not filtered enough. It's high frequency component can get very annoying after a while. Maybe turn it down or run a low pass. I also feel that there is too much high freq on the transitional "fuzz" too. In addition, I think you should reveerb the snare a little more. It sounds a bit flat at this point.
0:56 Again with the transitional "fuzz" Its frequency is so high that it becomes overwhelming. A simple filter could fix it, even just a little low pass. For some reason, the 16th note lead mentioned above becomes less piercing here? Did you mod one of its parameters? Because it sounds much cleaner in this part.
1:18 :D :D :D D :D, However, I think the background noises could be turned down just a little bit. Or maybe the lead is the bg? I can't tell, they're both about the same
volume.
1:36 The bg noises are a bit too loud for me to fully enjoy the eerie drone.
1:53 This transition just feels so out of place. The ascending then descending "buzz" I feel partially kills the mood that the song has worked so hard to set. Combined with the fact that it's so loud, I was very shaken when it came about.
2:16 ???? It feels like you spliced to songs together at this point. There's no real transition between before and after, it just kind of switches. Fortunately, this interlude doesn't last very long, and you jump right back into the main theme
2:59 You let me down with the ending. I was expecting something awesome/crazy/mysterious to go down, but instead I was met with a fade out. I guess with the ambient nature of this song, it's acceptable, but not nearly as good as it could have been.
Overall: You have all the parts, there's just some polishing up you have to do. Tweak your levels, especially so that some instruments are subordinate to others, and you don't have 3 leads all playing at the same volume/frequency band.
Hope this helps!