In case you hadn't already heard about it, I wanted to share this project with you:
Myself and a handful of other chip artists/VGM enthusiasts put together an album of Castlevania songs that depart from the familiar, sinister tone of the original tunes in favor of something decidedly more jovial.  It's called "Happyvania" and the whole album is available to stream for free on Bandcamp.

Enjoy!