German Genre movies are not something we see often. And when they are made as well as this one, it is even better. Moritz Bleibtreu is almost a guarantee for quality, now also behind the camera. Now the movie itself or rather the story is or can be perceived as flawed to a degree. Some may not be very fond of the movie not answering/spoon feeding you answers of questions it raises.
There are certain things that probably will only be clear or clearer with a second viewing. As it is whether you know what the twist of the movie is or not, it will be quite the ride. It may even be better to be a little prepared by knowing where the movie is heading. Still there are quite the confusing scenes in it, which I think make the movie and the story even more intriguing (like characters literally popping up, the mirror theme and so much more).
And then the movie probably has the perfect ending. At least I think it is - some may feel it is pandering or they might not like it at all, but the mood it sets, the vibe the whole thing has ... the uncertanty it gives the viewer - the style it is shot (with some back and forths in the editing) ... well it's good to say the least
