I think they may have just shown the first couple of floors of the dungeons.

Some similar games will change the way the dungeon looks once you get far enough into them.

They're referencing Wizardry 1 here, which had characters named Trebor and Werdna. (Not to mention Wizardry 4, where you get play as Werdna; seems like you get to play as the demon lord here as well, once you've beaten the "main" game.).

Wizardry 8 also does something like this, with Nebdar, though she is actually a secret boss in a secret throwback area. Also, her name is an anagrap, rather than the original name spelt backwards.

Even before that, Rogue has the Amulet of Yendor

In all these cases except the Rogue one, the name is based on the name of one of the developers, so perhaps the demon lord's name is based on the name of one of the developers of *this* game?

Perfect opportunity to finally release Surt R./Graverobber Foundation's "Geister" trilogy as well, no?

Das Geisterschiff (1052 votes)
Der Geisterturm (906 votes)
Der Geisterjaeger (636 votes)

Oh yeah! At those vote counts, I certainly agree. ;) While I understand (what I assume was) GOG's original rejection because they got few reviews/sales on Steam, I still hope GOG unrejects (if need be) / accepts those.

Also I didn't realize Ringlorn Saga was already here.

Neuroworm has almost 50 votes; I'd much prefer prioritizing the ones with more votes of course, but I certainly wouldn't be against this showing up too:

https://www.gog.com/wishlist/games#search=neurowo

https://www.youtube.com/results?search_query=neuroworm+gameplay

I discovered that this game is actually an expansion of a game jam submission called "Demon Lord". So, playing that I got some ideas of what the game, at least in its game jam iteration, is like.

For example, in the game jam version:
* You start with a random character, and there is a spot early on where you can recruit more random characters.
* That spot also doubles as a place to heal.
* Dwarves seem to be quite strong. I ended up having 2 of them, both with over 100 HP.
* Worth noting that both Dwarves ended up with the same skill list.
* No way to control your characters' actions in the game jam version, but they don't require any resources to use. (This appears to have changed in Reincarnation.)
* You recover a substantial amount of health after each battle, though dead characters are removed from your roster (but if you go back to near the start, you can recruit new characters to replace them). That spot where you recruit new characters also doubles as a healing spot. There's no other way to rest, it seems (another thing that Reincarnation may have improved on).
* Seems that enemies can spark new skills.
* Game jam version has no save feature.