Though I got to Dark Perpetua around level 60 and I'm getting filtered hard. I probably didn't do my stats very well (roughly equally putting points into Power/Allure/Willpower with some in others). What are peoples builds like?
The late game battles are gimmik battles because the dev doesn't know how strong the player is.
The player can level up at their own pace, and levels have a significant impact on growth.
The Hellhound's gimmiks being, being undefeatable and needing to properly explore the labyrinths.
Dark Perpetua has multiple gimmiks. She invalidates buffs and debuffs, has a powerful grab, and can take multiple spirit from you.
If you use analyze on her and read through her weaknesses though, you'll realize something that should make it very easy to take her down.
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Regarding builds, my 3 big sexual interests are.
Femdom (sexually assertive females)
Intercourse
Buxom babes
So I built my character accordingly.
Allure is my main stat.
Since I like sex, I put points into willpower and max arousal so I can survive sex stance.
Since I like femdom, I don't want my MC to be doing sexually dominant stuff, but mainly use buffs and debuffs, so I invested in Int and a bit of Luck.
Of course I have a minimum of 10 in each stat.
Personally, I think the best way to play this game is to play your sexuality.
If you are an aggressive and dominant person who wants to sexually overwhelm the girls, than you can do Power as your main stat and take perks that focus on binding, and make your Max Arousal high.
If you prefer foreplay like paizuri and footjobs, you don't have to focus too much on defense since the indulgent skills in those stances ignore defense anyway. Going allure and max arousal makes the most sense there. Indulgent skills also have no mana cost so you don't need Int IIRC.
etc etc.
I think it's best to build your character based on your sexual interests. If you struggle with expressing your sexuality through your character build, you can ask for help. Just tell us what you like and don't, and maybe we can help you build your character so you get the most out of your interests playing the game.