Pretty good!

I liked this, mostly. There is a very strong Pink Floyd influence here, especially for the first half of the song, which I was really digging. When the pace of the song picked up however, the melody seemed to contrast too much with the initial sinister/ethereal sound of the first half of the song which was a bit jarring to the flow of the piece (to my ears). Some of the synth choices towards the second half were also a bit questionable due to their overtly cheery sounding nature (again, a contrast issue compared to the first half).
Obviously the upbeat second half was done on purpose, so im not gonna knock you for it, but for me, personally, i'd have preferred the song to continue flowing in a darker direction, somewhat akin to Another Brick in the Wall (which is what I kept hearing as the main influence to this song, especially with the initial bass line).

At any rate, all in all, a well put together piece, with good production value and excellent sounding drums (and roto toms? :))
9/10
4/5

Cheers,
Daniel