All rather predictable and except towards the end, rather lacks tension. You could make yourself a cup of tea visit the loo during the first half hour and not really miss much. It is really an Alien clone with rubber snakes from a 1970's Doctor Who set. They seemed to be really easy to kill or run away from unless they came up from behind unexpectedly, and the camera stayed on them long enough for the viewer to see that they were poor fakes. It is rather confusing in places and as mentioned elsewhere, time seems to slow down right at the end. I could not see the point of having a character fall 30 feet onto a solid and obviously die, only to be resurrected and killed off again in the next scene. The minimal gore is restricted to the last few minutes of the film. O.K. to watch with a beer and popcorn but not scary enough to be good or bad enough to be funny.
