As another commenter said, this game is incredibly charming. The dialogue and story behind the game kept me quite invested, and was really fun to read... and I just love the personality behind the narrator! The dialogue did occasionally zoom by which made it hard to read it all, but to be honest I could've been accidentally clicking through it while building. Regardless, in my opinion, the story and dialogue is what this game does best. I love that the narrator oozes personality :)
In regards to the gameplay, I found it pretty entertaining overall! However, it took me a bit to figure out what exactly was going on initially. I think that a short tutorial may have helped, however, I think that if you simply add titles to the different buildings in the cost drop-downs it may not even need a tutorial! The building mechanics are very intuitive, but if there was a word like "Factory," or "Storage," under those respective buildings it would be much easier to pick up and more intuitive overall. Regardless, I really enjoy how the game plays and the way in which structures could affect the type of currency (like how the fire summoning circle made fire shells).
I'm a big fan of the use of shotgun shells to tie into the theme! The fact that the setting is within a shotgun is truly very interesting and piqued my interest while looking at the cover image, it just really elevates the way you think about the game's setting. Also, I love how well the sound aptly fits into the theme, it's grungy and gritty in a way that screams factory. That goes for both the sound effects and the music!
Overall, I found that the story, idea, and atmosphere were all splendidly done. If the game is updated so that it is more clear what to do initially, I believe it'll improve even more. With some more time, this game could absolutely blossom, and I have no doubts about that! Keep up your writing and narrative ability, the sheer dialogue is what kept me hooked most. Did I mention that the dialogue is really charming and I like it?
Great work :)