A decent British horror about some chaps hiking in Sweden, different enough to be engaging, although is fairly standard. The Romanian forests (which they chose over the Swedish ones probably because it was cheaper to film there) are a great fit for such movie and nature surroundings add a lot to the overall atmosphere. The chemistry between characters feels natural and the things they discover in the forest are unsettling and genuinely creepy.
The incident shown in the beginning is a great motivational point in the story which explains why they ended up in Sweden, but instead of leaving it as it is in the beginning and inevetably returning to bringing it up in the dialogues, they re-use the very scene to death throughout the movie, pointing all the lights at it again and again.
The forced stupid happy ending harms this movie a lot, a very stupid and unlikely resolution.