I liked it. Although its not quite what I'm looking for when I think Fugue, your spin has a nice ring to it. Like Nemo said, there were some parts in the middle that just didn't work well to my ears.
I'd definitly like to see this with an electric guitar addition to add an almost ominous, Castlevania-esque feel. Though that's just what I'd like to see out of Fugue. 9/10