I didn't even finish Shovel Knight yet...
But the beauty mark on the Enchantress face kind of gives away who she is...
spoilers!
Don't click it, don't quote it, if you don't want to read it. ;)
Edit:
Since we're here, I'll talk about Shovel Knight music.
It was actually executed on a REAL NES and recorded as stream which is then used in the game.
There's a .NSF file made and shared in the Internet by the author himself(Jake Kaufman).
YouTube Video Placeholder
There's links to the files on the youtube video.