I also got stuck in the ground pre-boss save. But, I pressed "j" to bypass that, wink. Fun boss.. Although, I'm at the Labyrinth and I swear to God there's no way that doesn't lead to a kill screen. there's one on the left, one (or two) on the bottom, and one (or two) on the right. I swear I've been everywhere, aaaaahh.
Also, the second two holes you see (on Labyrinth of The Guy screen) your character sprite appears behind them instead of in front of them. Dumbest bug I can possibly bring to light.