Nothing but dark.
Your last couple of tracks (500, Hostile) have had this dark, creeping feel. This song right here is following in their footsteps. It's a nice sound to work with since it can convey so many emotions in such a small time. The drums remind me of Clubbed to Death, with the vocals and piano really backing up the beat. Like Starwolf said, the next song being horror rap, or even just a deep, dark, creeping feeling would be perfect.
~Tzu