So... so far I was able to get the ending where you get eaten for good. I restarted and tried to "wait by the vent" as one clue suggests. But it seems like even if you do that, you get teleported back to the monster while you're crawling through the last vent. So is there actually just one ending or more?...

I threw the key while in the vent and it went through the floor. Might as well die...

Goated