This film is simple, there are no flashy effects, no huge cast of extras, or spectacular scenery. Its a simple premise and it works because we've all been in those situations - you take a wrong turn, your GPS messes up or you lose signal, and you think 'what if?' - this is the 'what if' scenario happening.
I found the cast were good, the pacing was fine, yes there were annoying things that happened and some moments where I said "I wouldn't do that" but overall its a good watch and I liked the ending.
If you liked Eden Lake, Wolf Creek and Killing Ground; you will like this.