Overall I liked it. Great single-location horror, great presentation, had me hooked pretty much all the way through...

And then they hit us with that ending. I feel like we needed another 5-10 minutes or so to explore exactly what was going on there and why. I don't need to be spoon-fed, I think I get most of the implication of what happened and why, but it's waaaay too ambiguous. Still worth watching.