This thriller has a pretty great central performance, and like others have noted, owes more to the legacy of Italian giallo movies like Deep Red that Spanish horror. However, it is very engaging, and really keeps you tense for the first act and most of the second, but when you get a concrete idea of what exactly is going on, the logical flaws and ideas raised in the first act feel a little dishonest and inconsistent with the last act.
Given this, I don’t think the movie has a high level of rewatchability, but I did enjoy it enough, but felt a little disappointed in the last act, when what was going on became clear.
Didn’t work for me because of it, but as I said, the main central performance was terrific, despite this.