The movie was on it's way to being a really good film minus some rough dialog, but i feel like they didn't know how to end the film and it just comes off as lazy writing, they did a great job with the atmosphere and cinematography but ending it like they did just felt like they didn't know how to land it.
There were some pretty good practical effects used so props to them for not going the CGI route but at the end of the day i feel like the ending hurt this film really bad. You can't build up suspense and atmosphere and never finish the story you started to tell, it's a real rug pull the audience because this film had potential to be great but a mediocre send off takes a lot of points off.
That is why I have to give it a 5 out of 10, It's such a shame because i was really invested in the story.