Hiya! Here are some stray thoughts I wrote down while reading this!
immediately in love with the visuals for this creature. black ooze with white specks. predator in its natural habitat. very cool.
oh lord this thing is gonna have a BODY COUNT. very strong (but thoughtful weaknesses balance it out)
map feels good, i wouldn't have minded some numbering in addition to the indicators just to have something easy to distibute to players (we usually do this at our table by taking and carefully cropping a photo and sending it to the group chat -- this is a minor gripe tho, easy enough to add numbers after taking the photo)
i like the intruder red herring, and the luring a player outside for a snack.
could easily see how the drama and horror would escalate here! nice work!