Really nice to see a simple yet fun dungeon crawl. I'm a sucker for roguelikes.
That being said, since this is a demo, a few suggestions:
-The game feels very slow-paced. Maybe try upping the walking speed and the reaction times anytime someone makes an attack or whatnot.
-The controls are a little clunky, mostly in regards to the inventory system. Overworld movement works better with keyboard, but inventory seems impossible to use without mouse. Maybe let people rebind keys, or give more options so that the inventory is easier to use?
-There's a lot of stuff in combat that's unclear - the 'souls(?)' for the characters and enemies,for example, and what exactly the blue bar is for (since the white bar is obviously health).
-It was also hard to realize what some of the items did - I wouldn't have thought to use the ruler as a weapon without some sort of tutorial or mouseover tooltip, or the pocket watch to skip turns.
Overall though, a game with a LOT of promise, I'm already interested to learn more about the world and story. Just, I think it just needs a few quality of life tweaks.