You got something going, for sure! I loved the sound you start out with - it has a lot of potential for scary stuff. Now I do feel as if your song is a bunch of separate ideas splashed together - it lacks cohesion a bit. Those separate ideas alone have potential though! The ending too is a bit sudden, did you not know of a way to end it perhaps? ;)
It is definitely spooky, it feels as if it could fit nicely in some form of long hallway or "between the mansion walls" indeed. Overall, I think it is not too bad at all and got potential, great job!