Started off strong but...
It's a well-made sci-fi Silent Hill ripoff, like one big extended cut-scene plus a big boss at the end. The longer it went on for, the more they copied, and the more irritated I got.
The end almost redeemed the movie as it introduced other references e.g Lovecraft, Hellraiser etc which helped break up the preceding unoriginality, but I would have enjoyed this a lot more if they'd done so faaaar earlier.
Could have done without the last scene too, didn't do anything for the plot.