Your cover art/title screen is adorable!!
Great use of the theme! With deaths clearing up the visual as it goes on; noticing that kept me going!
Getting in some last minute ratings, so I did have to quit after like death 6 and still not making it out. Checkpoints would be good, and broadcasting the deadends a little earlier, emphasizing the advantage of the clearer vision once you can read those signs, would be perfect. I didn't play deaths 7-9, so I don't know HOW clear it gets or if additional text or hints can be read on the signs as it clears further.
I reached the area with the still ghosts and the sign that said "Don't look back." Being different from the rest of the dungeon seems to signal being on track to the end, but I kept running into deadends and decided to search elsewhere. Was I in the right area as the environment would suggest, or was it just a neat little spot in the dungeon where the ghosts hang out? Asking as, if that is on the way to the ending area, I think it was a good way to nod to the player that they're heading in the right direction.
The little ghosts scared me right into a trap the first time, charging at me like that. XD