I'm aware a ton of others have already mentioned it, but yes, getting to the elves and speaking to the one in front of the castle to pick up the quest for the corrupted tree mother will functionally softlock you: the file for the tree mother fails to load, and prevents you from leaving to any other area.
On a different note, a bug that I'm not certain is a bug and not just an unfinished segment: speaking to the neko twins after finishing the pyramid (Nala and Naya I think?) has them give you a quest menu with some very fancy names on it, but most of them are just duplicates of Riley's supply order "quests" from the Lakeview guild, while the first and last quests on the list are different, with the first one having them tell you to talk to a dude with a turban who can't be interacted with, and the last one just closing the menu when clicked on with no dialogue whatsoever. Again, not sure if that is a bug or just unfinished.
Last thing: a ton of quests you can pick up will just never leave your quest journal even after you've ostensibly finished them, while there's also a ton of neat interactions or great items that you can completely miss if you just forget to talk to somebody or give someone something that wasn't listed in a quest, which just feels a little bad, and while I know that making a quest for every single last "go fetch/kill/do this" request is a pain in the ass, cleaning up the questlist's functionality so you can remember what you have or haven't done, who you do or don't need to remember to talk to would be nice. I get that the fortuneteller succubus is mainly for leading you to people you can add to the mansion, but maybe you could add a similar NPC for minor sidequests that a player may have missed, just a kind of "hey in __ location, there's someone who still has something for you to do" without making you do a loop of the entire game trying to see what you have or haven't hit would be fantastic. Also, a few quests that ended up at the bottom of the pile of "pretty sure this is done and I just can't get rid of it" were written in Spanish, despite everything around them being english, so I assume that's unintentional.