Is it possible you can make a endless mode ... Not the cursed or blursed modes, just a endless mode that goes on until you can't ... otherwise I don't think I can have to much more fun in this ... I will say the raid mode is my favorite rn because of the big party.
The big problem is that that kind of "endless mode" requires limitless difficulty escalation. The encounters in the game seem to be hardcoded (ie, there's one at a specific level with a Bramble and a Rat, rather than Bramble and Rat being random enemies that can be paired in any arbitrary encounter). The Lich always comes with some Bones and not Imps or Slates or whatever, because that's what the Lich encounter has. And so on.
Maybe the game could add enemies from different encounters together, e.g. Level 21 could have a level 13 encounter added to a level 7 encounter or something, then 22 does 14 and 8, etc. But that seems pretty hard to balance or playtest; it could probably work when both encounters are straightforward, but plenty have special design gimmicks that might not interact straightforwardly.