I've only been able to get around to playing a couple of levels, but Shovel Knight: Specter of Torment is incredible! Yacht Club really gets retro-style game design better than any other independent studios do.
I definitely prefer Specter Knight's playstyle. Not that Plague Knight's wasn't fantastic, but it was nice going back to a melee style, and I love his dash cut and wall jump abilities. I'm really excited to see how King Knight's going to play after finishing this one!