I loved this game's aesthetic! It was very eerie sounding, and creepy looking, and I really like that. The puzzles were fun to figure out. The only one I needed help with was the Sea. I do think that the voice volume sounds fine, but at first, I wasn't aware that the voice was a hint. I was just under the impression that it was part of the ambiance.
Overall great stuff, and would love to see more! :)