It's fine. I like the set design, the sound design (I liked that light bulb hum), and the acting is solid. It has some genuinely unnerving moments and inspired choices, but it ends up a bit of a nothing burger for the dramatic dominoes it lines up. It gets tedious at times, too, which would be ok if it hadn't hit the ground running. Adaptation-wise, for liminal entrapment from undercooked properties, I much prefer Exit 8, and for doppelganger horror, there's far more to glean from Annihilation.