Dev comments in their plan for this year has relevant points that I’ll quote here.

Halls Quest

While I don’t want to make the game overly long, a bit more gameplay at the tail end of the game is sorely needed to give players a bit more time with finished builds and time to make use of armor abilities. I have a few ideas for interesting quests that could test an endgame character.

Alt Paths?

Another common request is to have more dungeon floors, but just adding more risks making the game too long. An alt path could offer new environments and enemies without making the game directly longer. This would be a huge time commitment though, so I’d only really consider it when ShatteredPD is otherwise finished.

Endless Mode

Some form of endless mode is a very common request. This partly ties in to the last region of the game being the shortest, but also there’s just a desire for players to see how far they can get with strong character builds. I have a few loose ideas for how endless might work, but want to focus on other things like new quests first.