Monolith received plenty of negative reviews over different websites, multiple 2-3s out of 10. In my opinion these numbers are unfair, especially considering that there is a lot worse in the movie industry.
The initial idea surrounding the plot is undoubtedly interesting, it even reminded me of "Black Mirror" because of the slight criticism towards modern technologies and wrong habits. The ending is fine, even though it is a shame that we do not get to know more about the ultimate resolution between the protagonist and her husband.