They aren't even trying to hide it, this is blatantly sending an OC into Kamidori: Alchemy Meister and yet it's completely ignoring the game it's trying to use as a base. It spends half of a chapter explaining that the stats the game uses have been replaced instead of just going in with a made up game. A few chapters later, the cultures he finds are completely unrepresentative of the game as well, so we're basically just using the protagonist of one game plus some real-world knowledge to create our own protagonist...which makes me wonder even more why we had to base the protagonist off of an existing character when that character's relationships, ideals, social status, etc are not going to be able to be used in the story.
The character himself is also pretty inconsistent, berating himself for accidentally shouting out how wealthy he is before immediately pulling out a super expensive-looking mythril hammer that he barely knows how to use.
The technical quality of the writing itself is passable. Typos show up somewhat often, but I can at least tell what's going on despite the confusing premise. I just wish we weren't subjected to "Oh right, I've got the same X as Kamidori" followed by actions that could easily be accomplished by standard isekai "Item box" or "crafting" skills