Craig J. Clark’s review published on Letterboxd:
"There's all kinds of bad things going on in this picture."
Ben Wheatley is squarely back in Kill List/A Field in England territory with this hallucinatory trek deep into the woods to commune with whatever's dwelling there -- by whatever means are deemed necessary by those who wish to make contact. (Wheatley's weapons of choice are his disorienting quick-cut montages and Clint Mansell's aggressive score.)
The framing device about a deadly virus ravaging the outside world almost seems superfluous since these characters don't need much of an excuse to isolate themselves, but it does give the proceedings an extra punch. Take the moment where one of the characters says, "It's just odd, being outside for the first time in months. It's just hard to take it all in, actually." Who can't relate to that sentiment?