Maybe in a 2.0 version? "Devil (still) has to die!", haha. This was my first attempt at a business card format; my concern was that the material would still be visible despite its small size. But it's open source, so I’d be really happy to see new versions or interpretations :)
I think you're right. I made some changes to the current file: Updated the final boss information to clarify when the Devil appears. Added two items: a +3 Damage Scroll and a +3 Defense Scroll, both for single use. Removed gold from the item table and introduced gold rewards for defeating all enemies in a room.