This is only my opinion:
Theme: Very related to the theme and I enjoy exploring and discovering stuff in the dungeon. 5 stars without much doubt.
Fun: It was fun in a way but it lacked quite a few other features that could have made it a better experience. First of all a monster chasing us, a small mini-game, etc... Therefore I gave it 3 stars because I just found it a solve mystery, walking sim.
Controls: Deserve five stars, are smooth and don't glitch out. 5 stars.
Graphics: They are good and I don't have any objection, still it needs context, I only saw a lot of lumps, dead demons? etc... Therefore 4 stars.
Audio: It's perfect but there is only sfx, nothing else. Therefore can't give it more than 3 stars.
Originality: It's not new but it's not seen often in games. Therefore 4 stars.