Mmm... it was an interesting premise. It looks like it has all the ingredients for something longer running, it just doesn't do it for me particularly.
I assume the author's comment at the end is um.... a remark on the huge popularity of isekai genre works, and that he was cynical about it because it's kinda overdone or the market is saturated with that stuff.
He's the Sentai Daishikakku guy, so I assume he likes to invert tropes or at least not play them straight.