"On the action side of things, Cornish display's a talent and confidence rarely seen in a first time director, ratcheting up the frights and the thrills every time the exceptionally designed and rather terrifying looking aliens – realized terrifically through a combination of costume and CGI – give chase. Jump scares abound, while a sequence along a dimly lit smoke filled corridor is fraught with tension. The rest of the time, chase scenes pulsate with intensity, backed by a stylish score by Steven Price and Basement Jaxx that mixes orchestral music, R&B and electro, as well as classic UFO sound effects. The violence, when it happens, is deliciously grisly." - Tom Clift, Movie Dex