It's well written, it's well shot, played and with good music. What else do you want? Ghost Busters? Spiderman 14? What is sci-fi to you defines if you will like this movie or not. The story is original, unpredictable, minimalistic. It is shows you all the details very slowly and gradually, so it does not spoil it before the last minute. Definatelly worth the watch if you're a real sci-fi or cinema fan.