Cheers for checking it out! Your feedback is invaluable <3
As for the combat mechanic, annoyingly its kind of a symptom of our overly ambitious plan at the beginning, as killing monsters is supposed to level you up and increase your base stats so that you can keep up with the scaling level of the enemies as you go down floor by floor. This does exist in the game, but its not shown anywhere in the UI other than your health increasing, and its definitely not scaled well due to lack of time. So killing enemies is supposed to be a form of progression character-wise, but its definitely missing a great deal in that area as you say :)
We're definitely planning a post-jam version to patch a lot of these holes and bugs haha. Cheers again for checking it out <3