Hmmm...your instrumental setup and mixing leads me to think that this song is about to drop the bass somewhere and evolve into a horroresque electronica smashthing. I'm not hearing it so much as horror background lol. In fact, I think this idea would work great with a nice beat, since you already included a few synths and that bassline. If you really want to go for a horror background, I would suggest removing that bassline first of all, and going for a quieter mix overall; not so rough with the pizzicato strings and piano, but instead have them whisper. Though I'm sure someone could use this for the purpose you intended, I think it's a little ambiguous in its direction; is it trying to be scary or is it trying to make scary sound cool? I think you've got a good start here...it just needs to expand!