I’m from a family of miners, so I was initially drawn to this thinking it was going to be about miners themselves. As a fan of traditional folklore, I was delighted to find that it was actually about kobolds (in their original, non-ruined by D&D form) trying to get out of the mine. Whimsical and fun, and the tone of the game is really neat, with it being written like an older kobold teaching a newbie the ropes.
As for the light in the darkness, I think it fits within the theme, but its a little bit of a stretch. Its adjacent to the theme, but it is light-hearted and fun, and I think that more than makes up for it.