Great visual design. The dithering effect on the lighting looks especially great.
I like the concept of having to return to the beginning of the dungeon after you get the thing.
It seems really hard to avoid taking damage from the skeletons. They move faster than you, and each skeleton takes several hits to defeat. Plus, it seems like you can't even sprint away if a bunch are hitting you at once. I tried several times, but I wasn't able to complete even one dungeon.
Having an indicator of how long the sprint potion lasted would have been nice.