In my opinion if you don't want to do yourself a mental mischief the best way to view Knucklebones is as a comedy of errors.
Casting aside the predictable "B" grade credentials of this film, its inability, in my view, to actually settle on a simple core concept and stick to it, is the main reason its such a mess.
This flick constantly oscillates between vaguely formulated, uninspiring ideas. Its as if the whole thing tries far too hard, to be interesting and original. It would have been better off, I feel, basking in its "B" grade glory and just sticking with a simpler slasher flick premise.
The acting is OK, there's a little black humour, thats not too dreadful and there are a few "jump scares" but thats all I can find that's positive to say here. Four out of ten from me.