Epic. Love the dissonant, off-key piano at the beginning. Tune at around 0:45 is awesome. The higher notes in that area could use a little more legato, though.
Also, the organ is really awesome, though it isn't used often. But still, you're getting really good. *favorites*.
Only thing: could use a beat. It drags a tiny bit, and needs some moar drive.
Good but needs percussion
I like how the heavy piano at the beginning sets the mood immediately. I also like the way the intensity rises and falls in cycles. It could be improved with more variety in the climaxes. The low piano becomes monotonous after a while. One necessity that is completely missing is the percussion. I realize that the piano sort of replaces the percussion in this song as the tempo keeper, but I think percussion would have broken the monotony, and added emphasis.
Please contact me if you would like to use this in a project. We can discuss the details.