Went to this on Saturday and loved it. Only complaint I can think of is the dialogue was a little rough around the edges, specifically at the beginning of the movie. Felt like once it hit its stride the dialogue was fine, though.
Absolutely loved the sense of dread and tension that builds throughout the movie. As Roland said it's like a Sci-fi horror, which included one of the most tense scenes I think I've ever seen in a theater. The final 15 minutes were stunning as well.
This is one of those movies, like Blade Runner 2049, where I wish people would show up and support such a great film. It's movies like these that push the envelope of what cinema can and should be.