TLDR: Guy has humble beginnings, but almost immediately turns into one-punch man. Author shoe-laces him into high-level adventure while completely dumping his farmer-identity.
Honestly, it would be better if he'd, at least at first, inadvertently prevent disaster by being a single-minded hippy / farmer. Like creating magical plants that'd form a perimeter, or tending the land so well that he ends up creating "hallowed grounds" that demons cannot tread upon.
That sort of thing would at least play around with his identity as a "nature lover", instead of solving everything by being one-punch-man.
Still, it's readable. There's that silver-lining that some "isekai" do not have.