Cool

I think this is a really nice song, and i like the way the drums drop in and out. Also i'd like to mention the slow build up in the intro is really cool.

Could use some polish

Most of this sounds pretty empty. I feel like fleshing out everything would help keep interest through such a long track.
Dynamics could really help build tension or provide variation for the listener.
For what is there, it's pretty soft and would benefit from some switch in pacing. Melody is nice and decently catchy. When the drums drop out and come in, it's very noticeable in a bad way.