This kind of anime isn't exactly directed towards people who enjoy the story nor people who wants character development. Showing some kind of short traumatic past and then goes on to showing off their "resolve". Basically a gory shounen anime.
Story: Not much story, cool plot though.
Art: Very fat lines, very extreme expressions, wants to emphasize the violent part in this anime. Pretty good work in my opinion
Sound: I didn't notice anything extraordinary since I was only casually watching this but I do remember those splash sounds when they punched through the cockroaches' stomachs.
Character: As I mentioned above, they show a small part of the characters past but for me, it had no impact. Why? Because they used the same thing over and over again. They basically changed x and y only.
Enjoyment: I did enjoy this anime, as said before this anime is a gory shounen anime had it's cringy moments, but is overlookable since it has a pretty unique plot and it's gory.
Overall: Cool anime.