I started reading Shotgun Boy long ago while it was still on going and i totally forgot to keep going. But now I finally ended it and decided i should do a quick review about my opinion on it and share a bit of my personal spoilers-free (mostly) experience.
It had a huge expectation break for me, I started reading knowing absolutely nothing about it and got surprised about how things turned into. Not that I'm exactly complaining about, but i really kinda wanted it to be different.
The plot ends up being about monsters and it's totally connected with another work by the same author of Sweet home, which i currently didn't read, and I've seen people saying It's amazing and it's much better reading it first, unfortunately that didn't happen to me, but we gotta keep going.
Seeing Shotgun Boy as a whole, I liked it. It was pretty enjoyable, entertaining enough for making me go through all chapters and look forward to read Sweet home that is it's sequel.
Art: 9
There is nothing to complain about, it's clean, well made, and i simply love the facial expressions. A good art behind any story makes it more satisfying to witness for sure, the scenario as well isn't bad.
Characters: 7
There wasn't really any character depth, they were all OK and stuff but there was nothing to make me really feel enough attached to any of them, but as the sensitive and humble person I am I could still sympathize to them and feel bad if they died, but about deepness there isn't that much, the mc was OK, the antagonist was kinda boring and annoying to watch (the bully guy i forgot the name), Zero was nice, I liked the image he passed to us, so he's quite a good character to me, and all the others in my mind were like "OK, they're characters", nothing really that special. It's nothing that surprising coming from like, a side story for Sweet home that has only 69 chapters, so I'm not really disappointed, because even tho there wasn't THE character development the manhwa was still enjoyable.
Story: 8
It was nice, I liked the plot, the dialogues were great, the message was reflexive, it scaled really fast and unexpectedly from what was the start until the end that doesnt even seem the same story. It was interesting the way it could make me nervous about how things would turn, make me create my own theories about how everything would end. It was not the best and most insane plot i've seen, but it didn't disappoint me in general.
Overall: 8.
I'm not the type to judge things very deeply, as it isn't that hard to satisfy me with an OK story, Shotgun Boy is a rather short and good experience, and I wouldn't really complain about anything in it, u should go for it, mainly if u already read the sequel, or if you plan to.