Mikulunker
Spotted on TinyCartridge.com.
“Mikulunker” the Spelunker music and sound effects made entirely with Hatsune Miku Vocaloid software. Not only does this replace the original music and sound with Miku vocals, from what I can pick up, those vocals also describe the action, literal music video style. For example, the ghost theme now has the lyrics “obake ga yattekita” literally “here comes a ghost.”