The score, the title/credits font, the camerawork, the premise, etc. It's like a giant homage to John Carpenter (and George Miller, to a lesser degree). If I wasn't so sure that Neil Marshall was talented, I'd probably say this is just him aping Carpenter. But with his previous films in context, this stands as a Tarantino-esque smorgasbord of 70s/80s genre films.
If I wasn't sure, I might even think Carpenter scored the film.
But this is as close as anyone has ever gotten to nailing Carpenter 80s genre filmmaking.