The main reason to watch it is 1990s atmosphere - with hand-drawn everything, specific old-style music, and atmosphere of the city which feels vaguely cyberpunk in nature.
Breakdown below:
Story: 6/10:
There's a shot timeframe for the movie, but it does decent job presenting the storyline, characters, and showing you how the event unfolds. The events are presented in sort of indifferent way, so you sorta get glimpses and hints of what the people there are, what events happened in the past, etc. Narration style is similar to, for example, "the humanoid". They just show you the story unfold from start to finish and that is it.
Art: 6/10:
I liked it, due to 1990s aeshtetic. However, good portion of the anime is horribly dark, and, say Magic M-66 had more fluid animation than this. You get a couple of old-style monsters that are drawin in a way t hat doesn't happen often anymore. Those are interesting to watch/see. The style of characters/faces is also older one - with triangular "tall" faces with "thin" eyes. Then there are hand-drawn explosions.
Sound: 6/10:
It is pleasant and matches the atmosphere, but that's it. It doesn't reall ystandout.
Character: 5/10:
The anime doesn't go out of its way with character portrayal. The characters are shown one after another, you have glimpses of their personality and they look believable. However, characters don't really like talking much, so their characters don't even matter too much, and aren't that memorable. They are pieces of the story and tha'ts about it.
Enjoyment: 7/10:
I liked it, mostly for the old-style 1990s aesthetic and atmosphere (demons, cyberpunk, night high-tech cities, etc). As I said it reminded me heavily of Wicked City and older movies in general.
Overall: 7/10:
This is a good anime, but it is mostly worth checking out if you're into 1990s style anime. It is similar to Wicked City, maybe Devilman Lady, has similar palette/art, and similar older style music. No annoying teenagers in school anywhere in it, just showing you the world in the movie. I found it to be enjoyable.
So, it is worth checking out.
