Hi Komaru! Thanks for telling me.
This being a gamejam game I have made most of it in a pretty sleep deprived state and I'm actually looking through the code right now, to catch a few bugs I have missed the first time.
Expect this to be fixed soon :)
Edit: Ah, I've actually just noticed that this is a network error. You're playing the web version, right?
That sometimes happens if the internet connection is slow and has trouble loading the images in. Did you try to rollback?