The skull demon is immune to lust (so charisma), but he is intended to be fought early, so he is easy. I can agree that Witer's ghost quest should be mandatory before the dungeon, even if it can be done sooner now and bombs technically make it possible. Speaking of, consumables are limited to balance, otherwise one could spam 99 bombs and potions (and other throwable stuff later on).
Still, a quest log has been on the to-do list for ages, but low priority and it's hard to code in, my guide, this place or the discord server are all valid alternatives tho~.
No things are done for naught tho, they all give rewards and will likely be requisites for other quests later on, should you want to get more AP (and spend less on bombs) by replaying the game quick, holding CTRL to skip dialogues helps a lot (easy mode is even faster but gives less exp and drops).