So I might've softlocked myself...
EDIT: A quick refresh of the page fixed it, but I lost all of my progress. This time, I tried to pull away a bookshelf, but when it hit the spikes, it respawned on top on me and pushed me out of bounds! A "respawn at checkpoint" button would be really nice. Also, the battle music keeps playing whenever I die, but I didn't really mind it that much.