Dj CUTMAN + Sammus released Nerdcore Instrumentals, seven beats from Castlevania: Symphony of the Night produced by Sammus and remastered by Dj CUTMAN. It’s a name-your-price download from Bandcamp.
Joshua Morse’s Tears of Blood, a remix of Bloody Tears from Castlevania II: Simon’s Quest was posted for free on Overclocked Remix.
Mykah released a Tech House tune, Ghost House, and while it’s not from Castlevania, it’s possibly the spookiest theme from Super Mario World. It’s a free download from his Soundcloud.