Greetings from the UK! Slept on the theme, but didn't come up with anything super thematic. Have got an idea though which loosely fits the theme in that you have limited visibility (you see 'nothing' of the level), and you have 'nothing' as a useable item. Anyway, two hours and one coffee in, and have done very little other than writing ideas and spending too much time looking for tilesets.

Think I'm going to make use of these - 6000 32x32 dungeon themed tiles: https://opengameart.org/content/dungeon-crawl-32x32-tiles https://opengameart.org/content/dungeon-crawl-32x32-tiles-supplemental