Honestly, it was awful.
The cinematography was amazing, fantastic special effects (except for the reveal of the 'cancer'); you can tell the director knew what he was doing.
However, the screenwriting, plot and acting were all beyond awful.
This film was not scary in the slightest, I often found it cringy and frankly boring.
I could tell others felt the same, the cinema was full of individuals falling asleep and on their phones, and I don't blame them.