it's pretty cool i guess

Shounen predominantly have protagonists with a character/personality type that I would describe as comedic, mildly childish, but responsible with their duties. Demon Slayer doesn't quite take this route for the protagonist, and rather takes a more traditionally seen as seinen personality route for the main character, as I see many common qualities between Tanjiro and Tenma from Monster, both very mature and empathetic, combined with being responsible and duty-driven, but at the same time they each remain their own person. Tanjiro's ability to have meaningful conversations and empathy with even his most hated enemies, acknowledge they are demons that need to be killed to prevent humans lives being lost, but still understand them for the creatures they are and the humans that they once were, and to empathize with them in such a mature way that he's able to make them feel peace when dying, is outstanding character and story writing. The ability of this show that is able to make a few minutes of dialogue between Tanjiro and another be so meaningful, is pretty cool. As in case with Kocho, he had an immense impact on her will as a person just by genuinely talking to her for a few minutes, showing her individual choice matters and that trying over and over, will lead her further in life. This aspect of the show and Tanjiro's character causes pacing to lean on the slower side, not skimming over dialogue when it matters and to really make the emotional side of this show more impactful and meaningful. One of the problems in Demon Slayer relating to characters is Zenitsu, you can probably already tell why. He is annoying and not even really funny, his personality revolves around being an extreme coward and sometimes even disgusting, as well as liking Nezuko being one of his main traits. He has yet to get any development, even in the movie. It's hard to gauge Inosuke, he got some minor character development but remains the same loud, active, comedic personality. I hope both of these characters do end up getting more development as the series gets it's second season

Demon Slayer looks fantastic and has absolutely amazing animation, and the artistic originality of the character design is very different from most anime, with the eyes being vastly different from most, the foreheads taking on a more realistic sense, and the clothing looking very clean. The use of CGI in Demon Slayer is well implemented, and at times even ambitious and what would be considered foolish for using CGI on the main character in specific scenes, but it looks good and can even add smoothness to the motions at times. The soundtrack of Demon Slayer is wonderful, it's able to hold the "samurai" feel of some tracks, but combined with modern traits and dramatic orchestra sounding tracks. It's able to sound absolutely outstanding at times. When the scenes are more goofy and less heavy, the soundtrack can be extremely dynamic from it's switch to a SOL type of music. The show's able to switch between light-hearted scenes and extremely heavy scenes well, not switching between constantly but rather slowly, the scenes have their place. The use of the soundtrack and art style does this pretty well, with characters feeling real and having different moods, goofy and comedic scenes sometimes switch into a chibi-like art style, which is mildly unattractive, but with the dramatic scenes it holds up the seriousness of the normal art style, not really causing harm by using the chibi style in comedic scenes.

The story in Demon Slayer is fairly decent, with a little insight into the big bad Michael Jackson, but nothing really super compelling about him. Demon Slayer is able to make the smaller antagonists have worth while dialogue and screen time, but I want to see more about Muzan. The way the story is carried out is okay, it's like doing side quest after side quest in a video game, we've seen multiple big events from the missions Tanjiro and the gang get assigned to, but not much progression of the overarching story. It has a lot to be expanded on, hopefully this will be done in the second season. The main cast bouncing between side quest one after another causes the world building to be kind of incomprehensive, especially with not seeing any forms of maps or data on the world; it's a kind of bubble feeling sometimes when they're going about the story, like there's not much going on outside of it, this is enhanced by almost only having the story focus on the main three characters' journey, compared to a lot of shows where there is focus on other characters outside the main character's adventure.

Demon Slayer can fairly well combine light-heartedness while being able to do amazing things with the main character and minor antagonists, it's a fairly dynamic shounen, with a lot of things to work on and a lot of room to expand in.
Numerically wise I would put it at:

Visuals: 9.5/10
Characters: 8/10
Soundtrack: 9/10
Story's flow: 6/10
Story's complexity: 4/10
Worldbuilding: 6/10
Design and art style: 9/10