like is the demo a full product and the final will just be like, more of it, or nah.
Viewing post in You Will Die In This Place (development preview) comments
There will be ~3 more classes, ~4 more dungeon floors, some additional essays and components of metanarrative and perhaps a couple of other additions depending on how they work out. I'd estimate probably about 50 more pages in total, mostly towards the current 'end' but with some inserted into earlier parts.
My opinion is that the current version gives a pretty 'complete' experience in itself, but the final version will have more.