Just watched this. I thought it was pretty good. Plot-wise, it's quite simple and I gotta say I clocked the "twist" pretty early on, but the real reason to watch this is Gyllenhaal's stellar performance. He's probably one of the few people that can actually carry a movie like this, since it's all shot pretty much in one scene, w/ only him on camera for pretty much the whole movie.
Also I didn't know that this was a remake of a danish film of the same name from 2018 that apparently was REALLY good. Might have to seek that one out now.