I haven't played the game fully but I might have found a teleport bug. After obtaining the red keycard I was falling from 'Heimlich' to 'Unhemlich' but for some reason a random teleport happened which instantly teleport into boss room? I was able to replicate it again by hugging the left wall while falling down, the other teleport I was managing to get is just softlock under the dirt in the hub. just by saying it, sounds like its great for speed running any% if you ask me.