1) Good lord that dick is the princess elf's wife? Gonna be honest I'm kinda on the nameless older sister's side who tried to murder them. I mean a princess that naive and a fiance that much of an asshole seems... politically problematic.
2) I forgot two. Oh I remembered. Don't you love when a story introduces a new character through a FLASHBACK?! Not just any flashback but a flashback to a moment we saw happen in real time. Like it's at times like this I don't dislike "filler" because they flesh out the world in what feels like an organic way, not an "Oh that's XYZ character" cue completely out of place flashback to meeting said character during the literal last arc during a few panels (like I'm just saying we could have gotten this moment a handful of chapters ago at a slower moment; it was literally like a page worth of panels in the flashback).
3) I don't expect it, but you know it'd make for some interesting conflict if the MC just stopped putting up with doing whatever the goddess says when she says it with no initial explanation. Like she refuses to tell him why he's doing things or give him much more than a moments notice (save when he needs to prepare to not die), and he just goes along with it. A normal person would at least argue a little bit when told to make a water wheel with seemingly no reason behind it. On another level he could express some desire to make his own decisions. Like at this point the goddess might as well be the main character and he's just her medium.