Honestly, this is not quite good not quite bad. It is just meh. Some character actions are borderline idiotic and the protagonist's plot armor is very healthy. This just feels like your regular run of the mill isekai pure boy with some medical knowledge and a big boatload of naivety.
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LIKEHis weapon is main form is a spear but he can form it into anything. I suggest you just read the important details until you reach Volume 6. I'm gonna be honest that the first novel was bad since I am inexperienced as a writer and I was working without an editor and storyboard consultant. So yeah, happy reading.