It would be cool if there were any tower or something that would sent continuous waves of enemies which would only get harder after each wave(and a prize for clearing it like weapon or spell).
What about the "other world" quest? Have you added it?
That's actually a really cool idea for some post game content! It'd be a nice way of challenging yourself after clearing all other content xD
But what do you mean "other world" tho? The only 2 new side quests I have planned for the final release are the final part of huyuchi village's story, and another more minor side quest.