Not the best film ever set in an abandoned warehouse (aka cavern, aka old asylum etc.), but not the worst.
The girls do overact it a bit, the psycho lads can act and give real menace to some of the scenes.
The supernatural or horror aspect is something that may have been seen as original (shaky camera and odd angles) some years ago. It comes across to me as getting a bit in the way of what could be a better film.
The 'hero' character, for want of a better description, makes the last twenty minutes drag a little with frustration that he, the character, seems to have no common sense in going into the situation he does, an unnecessary dragging out of the end. I enjoyed it, but it's quirky and not an A class entertainment at all.