It's like a crossword - you can watch it to puzzle a little with the plot. But nothing more. No meaning, no deeper thoughts. Just simple mind-exercise. Very good acting though (Brittany Myrphy especially earns respect here. She adds complexity to her character, and deepens emotional dimension of this rather cold movie), witty directing and editing (it's a debut - bravo!), dark melodic music, and quite smart story, makes this movie... a good crossword.
Cinematography is rather poor though, contrary to what others here claim. Work of cinematographer is not based on choosing the angles and positions for the camera (that's director's part), but rather on choosing lighting for a scene. And this part sucks here - shitty lighting reveals cardboard origin of the sets, and reminds (oh Lord) "Saw" (2004). You can't focus on the actors, because you're constantly afraid of some wall being accidentally pushed to fall over. It COULD be bad work of the lighting team, or insufficient funds, but cinematographer is the one who gets the blame anyway in such occasion.
A nice touch is The Porter character, very nicely (yet a bit theatrically) played by Jamie Benge.
So summing up - very very very good B-movie and not so bad A-movie. Better to see it than not.
