Fraser Hannay’s review published on Letterboxd:
Senselessly depraved. Seriously, I'm having a hard time finding a point to any of the suffering depicted on screen. Even if the goal was just to make the most disturbing portrait of a serial killer, I only think it was a partial success. The camera work is nothing short of brilliant. Seriously, I would almost advise checking this out for the cinematography alone. Erwin Leder is horrifying in the lead performance, but the other actors unfortunately let him down. The young girl is never once believable, quite literally making every scene with her tensionless. And as an attempt to get into the psychology of a killer, I think Angst fails to reach any level of depth. An interesting experiment, but for a movie touted as being incredibly disturbing–which it is–I walked away completely unimpacted.