If you loved Tetsuo: The Bullet Man, try The Phantom of Regular Size
A bridge between a film you've already seen and one most people haven't. The Phantom of Regular Size has roughly 4.2× fewer votes than Tetsuo: The Bullet Man — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Shinya Tsukamoto, and they both carry the body horror, surreal mood tags, and they sit in Horror / Science Fiction territory. If that's the register that drew you to Tetsuo: The Bullet Man, the second film will land in a comparable space — through a different lens.
What The Phantom of Regular Size is
Back alley. Cicada summer. A discarded doll's head. Body dysmorphia meets stop-motion as one man's apartment becomes a mechanized hell. Wires and metal contort his flesh. Tsukamoto's early DIY horrors prefigure cyberpunk anxieties.

