Decent, could've been much more though.

Rating: 6/10 (4 April 2020)

This movie isn't too long at just over 80 minutes. Can't say i wasn't entertained as the whole premise of the movie is a good one. However, it should've been explored more deeply as shown by the movie's many flaws:

The monsters. How? Why? What even happened to the world? Are these aliens? No explanation whatsoever is given in this regard, the monsters are just bloodthirsty for the sake of it and i feel like we get dropped in the middle of the movie and skip the whole setup. Given its short length, this could be added in easily and also makes the premise more credible.

General illogical things. Why even bother having a baby when it's possibly the worst timing ever? Also it's pretty convenient for the shock value that the child's birth happens to be on the instant that the father is away with one kid and the other remaining kid randomly got mad and spends the entire afternoon until late in the night at the exact same grave spot where the small kid from the beginning died with his rocket thingy. She should have returned to the house ages ago.

If the father is oh-so-technical and even has a whole lab downstairs, why not build a house near the waterfall? Heck, here the woman can even give birth without any problems.

It took you over a year to see that these things may be vulnerable to high-frequency sounds? Come on.

The ending feels random and comes out of nowhere. So the woman randomly shoots an alien one time and it just goes down. She even is amazed by it. So you're telling me that no one tried to shoot these things before as they invaded the world? If one shot to the head takes them down that easily, then this should have been common knowledge ages ago.

I could go on. Was it bad? No, not necessarily in my opinion. The suspense is great, the common horror elements are treated well, but it is sadly undermined and not at its full potential due to the many flaws.
Overall decent, 6/10