Not in any way a horror film, this is a b-movie apocalyptic comedy which is a lot of fun. I love the red filter over LA, the red dust of millions of lost souls hovering in the air.
Double bill with Night of the Creeps for mid-eighties horror comedy spoofs, or Trancers for LA Christmas b-movies.

This is really the other half of the same
movie. One isn’t complete without the other (I intend to buy the deluxe edition at some point). Anyway, the animation is wonderful, the John Carpenter meets Hans Zimmer score great, and the fidelity to the comic book striking (noticeable departure? Superman and Batman’s fight spilling out of the cordoned off Crime Alley and through people’s homes).
I cannot recommend these/this two part movie enough. It’s up there with Mask of the Phantasm as a Batman movie that works better than most of the live action stuff.

A twist on Superman where he’s a horrible murderer?

Seen it. It was Man of Steel.