Maniac

If you’re going to watch a slasher movie, it’s going to be a slasher movie, no matter what. Given that, it might as well be “Maniac”. Character-driven, for one thing, and told from an unusual first-person perspective of the villain, played by the always-strangely-likable-even-at-his-most-degenerate Elijah Wood. Plus a really authentic-sounding ’70s-style analog synth soundtrack.