First, the positives:
I liked how the author had the dungeon core and fairy are romantically interested in eachother. Also the other voice actors were great.
The negatives:
None of the characters feel like people. They feel like summaries of archetypes of people.
The naration has a weird swelling/droning cadence to it that is grating on the soul.
If you’ve read/listened to a dungeon story before, there is nothing new or interesting. The author repeats the same words or story points over and over again (There was a point where they repeated the word ‘joke’ 3 times with only a few different words between.)