There's a lot of clever content here. I'm impressed at the amount that got done in a short time. Things are mechanically simple, but are a good use of the kind of levels one can get from WFC. Encoding things as a URL is also a good idea. There are some hiccups which I think take away from some of the fun. If one chooses an easy level or a medium level, there doesn't seem to be an obvious way to get back to the title screen. In editor mode, I had to scroll down and up to reference the keys. Perhaps a small popup in the corner with "R to reset, F to finish, Tab to change mode" would help. And the absence of a kill plane in editor was a little funny -- possible to fall forever? I didn't check. I made a smallish level.
https://www.carbidefunction.co.uk/while-vampires-sleep?map=AAAAAAAAAAAAAAAAAAAAA...