Seriously good and absolutely worth your time
I went into this completely blind other than seeing an article about and I really enjoyed it.
Good casting with pretty likeable characters in general. They did a decent job with setting up a bit of back story which wasn't that necessary but did help with character development.
The plot was decent, nice and tight and well paced. The characters weren't making constant terrible decisions à la The Walking Dead which was refreshing.
Decent enough effects which will be sure to creep out anyone that doesn't like spiders.
In summary, thumbs up from me. Give it a watch.