I was using WASD to control the character, and I just tried again and if you spam it enough it will happen I was unable to do it using the cards though
Oh, wow. WASD was a debug thing I forgot to remove hahaha. You're not supposed to use that at all. It's likely to be the cause of the bug.
I just uploaded a new version (both desktop and web). The level generator should (hopefully) skip faulty levels now.