me following the "magic" in this one isekai I used to like:
conjuring water out of thin air >> ... fine 😕
conjuring a bottle of potion >> that's

... alright, carry on
conjuring a handgun >> ... ...

... ... this is the last one, ok?
conjuring houses and built a village by himself >>

that's it, you're going to the lower 5
If it was a light-novel manga adaptation then it's fine, the anime still have a good source material to work with.
But if it is an original manga then good luck with that.