Overall, a really great example of How To Horror.
And they didn't do much with gore, or jump scares, and nearly everyone lived!
It was all style, and very textbook style, but with a few twists. Don't show the monster much; we'll make 'em shadows. Focus on the visceral horror of being prey; the mouth is the only detail.
I think it's a good primer.
(And the acting was spot-on from everyone involved.)