Overall pretty good. My expectations were low after a recent batch of similar base story, but this one actually develops well.
The art is also on the upper tiers, though not quite top grade.
I hope publication and translation last for a while longer. :)
In particular, it is quite nice how the development of humanity seems a little inconsistent, but actually makes sense.
(Power, be it in individuals, magic or technology is suppressed so as not to pose a threat to "Demigod" while low-threat but convenient technology is allowed to progress.)
I would still think that the progress is pretty limited for a time span of 4000 years, but it's not necessarily wrong if crucial discoveries have been prevented or erased from records as they could be used for war.