I would have liked it a lot better if... *spoilers*

I think it would have been better if they left out the crap about the snake, the crap about Rose seeing things, and making a huge obvious deal about Mike's illness. There was too much stuff going on in one film. The film ended up being about a time loop. Which is cool. Had all the other garbage they tried throwing in there (for no reasons at all) not been there, it would have been more solid, and clean, and just more enjoyable. They try make you think it has something to do with spirits, or some weird snake. There is even hissing in the mine, but the whole snake story really ended up having nothing to do with their situation. They were in an area that for some reason puts them in a time loop. That's it. And all that was needed. They could have touched on Mike's illness a bit---because that does have something to do with it. But they made that too confusing. Like, making us think IS IT his illness---is it something else? Just too much. The writers messed up on that. Sloppy. Other than that, it honestly would have been an alright film, with good acting and a cool premise.