I'm gonna be honest, boss, outside of the early stuff with Anna and the bad end epilogue stuff, I think part 3 was better. Hear me out, I just think that because Elizabeth's main gimmick was anal/prostate stimulation it makes scenes with her get kinda repetitive since pussy use is right out and the demons also focus that so THEY don't get their pussies fucked either. They end up feeling like weaker versions of things you saw happening in Part 3. That's just amplified by Elizabeth becoming MC for the game basically.
That and the western patrons getting antsy about weirder fetishes kinda kneecapped the demons doing demonic things and having excessive fetishes. Which means 4 kinda feels like a de-escalation when it's the final part. I hope whatever he does next is short enough he doesn't need any real feedback on it. Feels like it'd be better without them getting too much say.