Adam Moody’s review published on Letterboxd :
Among one of the best found footage style films to date, such a simple film make with effective precision. After quickly establishing its faux-documentary format the scares come in endless, progressively stronger doses. Co-directors Paco Piaza and Jaume Balaguero are passionate students of the horror genre, and they use that understanding of what an audience wants superbly; you are never given the chance to lose interest. The handheld camera techniques suit the uncontrolled pace nicely and David Gallart's crisp editing makes it feel like we are watching all this terror first-hand (often putting us right in the action with claustrophobic intensity). It is films like this that are relieving reminders of the creativity still present in modern horror.