This is bloody slick in the technical department - the music, the edit, the acting, the camerawork, all on point. The pace as well was mightily impressive, showing urgency and restraint at just the right moments. For a five-minute film, that's hellishly skillful.
However, the tension created by the filmmaking isn't all that reflective in the characters. Neither of them felt like much of a danger to each other, removing most of the suspense a cat-n-mouse film of this sort relies on. It feels like there are arcs missing, or something specific about these characters that we never see. This lack of malicious motive means we recognise the beats of tension but don't feel it. Two moments feel especially jarring: the part where he picks up the wrench, and the ending.
Perhaps with two added minutes, those particular character traits could have been hinted at. Nevertheless, this was great to watch. Also, THAT shot. Holy wow.