Hm, this is kind of... bad?
The alchemy system is not consistent and the world at large seems to follow simplistic game rules rather than physics.
The MC got the memories of a modern person handed to him, in one panel. We don't even learn his name or occupation on Earth. I can already tell it will have absolutely zero impact.
There is very little in the way of plot. The MC shows up and magically makes things better, Everybody is extremely impressed. The end.
Over all, 5/10. I think the author might simply be stupid or, charitably, maybe twelve years old.