I don't really see the point of him being a random villager, only to get the powers (and apparently the memories?) of the hero anyway? More so when everyone that the villager knows has apparently been killed. Why not just have him straight up isekai'd into the story? Or have him be the hero instead? Yeah it's more cliche, but if you're going to negate everything about him becoming a random villager, then there was no point in doing it.
Not that I'm saying this is a bad start, it's just (assumedly) unnecessary details like this stand out to me.