Under the limit, but acceptable for being honest!
I watched the entire film without knowing it was based on the real. Only on the later I came to know that and my stance has changed a bit. Because it's not always about the quality of the product, but something revealing truth is most important to me in films. It was honest and not following the blueprint of a similar kind was the advantage. Obviously it was a small budget B movie with unfamiliar cast.
So while watching it, I thought why they (film characters) not doing like this, that. Because entertainment films should do that for its viewers to please, but its notion was not that. It was depicting the actual event. Well, most of the crucial scene with the beast was just acceptable due to the category of film it belongs. Can't afford graphics nor trained animal, but I appreciate the effort.
Story wise, it takes time to come to the point. And then everything happens so fast before the end approach. Initially, the narration teases with a different kind of thriller, but after some developments, it accomplishes its mission. Like I said don't expect something like 'The Revenant'. This film is not for the recommendation, but trying it out on your own is not a bad idea.