Okay, so here's the thing: when you hear about a horror story, taking place in Ireland, you assume it's going to be rich in Irish folklore or mythology, especially when, in the opening act, the story expressly says the word "faeries"; so, when that's the promise, when a fairy story is waved in my face and, instead of 'Pan's Labyrinth', I get 'The Last of Us' in the woods, pardon me if I'm not brimming with gratitude.
So, here's the plot: there's a goo, the goo turns people into "fairies", and then stuff happens. That's where faeries come from, boys and girl, goo. Kinduh slurps all the primeval romanticism out of the fairy tale concept, now, doesn't it? What's even more eye-rolling inducing is the fact that whoever wrote this script didn't understand that, as in any ANY genre, the best stories reveal their characters, what they want and what they need. The couple neither want nor need anything, so it's just a generic home invasion/survival horror story with a pseudo scientific coat of paint slapped on a fairy tale wrapper. In fact, the more I think about it the more underwhelming and wasteful this movie is. At best, it's sci-fi for people who don't like science and it's fantasy for people who don't like fantasy; of which I fall into neither camp. It's not science fantasy, like 'Star Wars', nor is it realistic fantasy, like 'The Exorcist'.
The good parts: To its credit, the cinematography was top notch, dovetailing with some superlative sound editing. There is great atmospheric tension (at least in the first half of this story) courtesy of these two essential elements. The practical effects and make up are also well done. The "fairies" look creepy but not for the right reasons. They look like gooey zombies and move like Gollum. They don't look fantastical like The Faceless Man or The Faun in 'Pan's Labyrinth', they don't look magical in any way, and that's fine, the Gremlins don't look magical, they look nature-made despite clearly being fantastical; but you have to pick a lane. Are they zombies or are they a whole nother species, like, name a fairy in 'Hell Boy 2'? You have to choose between being naturalistic or fantastical, and, no matter what lane you pick, you need to keep your promises. Don't say "fairies" and then give me zombies.