First off, I love just about any metal/rockin' remix of Castlevania music (rock on goat and Minibosses!), but after hearing this, it reminded me that Castlevania music should work great in orchestral also. In fact, I would love to hear some more orchestral versions of CV music, that would be lovely.
Great work RC, I hope you do more like this for CV.
Edit: Abadoss makes a good point, parts of this really reminds me of the Fortress levles from Super Mario World, not to say that is a bad thing, but almost a deviation from the source material. Ahh, what do I know? All I know is that more orchestral remixes for CV (and other should be made).