Some thoughts after playing:
(1) First was the intro. After registering at the adventurer's guild, it took me WAY too long to find the inn. Maybe add a small bit of text for the guild master or the player to make an offhand remark on it being in the southeast? Unless I missed it lol. It's not a big deal once you find it but I legitimately spent like 15 minutes scouring the map and somehow missing it.
(2) I think you did a good job on the combat and difficulty scaling, which is pretty hard to scale properly in a game like this. Though without Aria's Saint II spell the succubus dungeon is pretty hard.
(3) If the image gens are fast / easy to do for you, I would like a folder included in the game to replace the interracial stuff. I can't imagine there's that many people from across the world in a RPG style town. Feel free to disregard though.
(4) I don't know how difficult it would be to implement code wise, so feel free to disregard this idea too, but the possibility of a bank or something similar, maybe at the guild? It would prevent some item loss upon death (because they're safely stored at the guild, though you can lose some stuff you bring with you), while also allowing you to access the "not enough money for the inn" event scenes without having to bankrupt yourself. (4.2) A party wipe with just lustful Aria and MC could lead to a (willing) monster sex scene while the MC is knocked unconscious, like what Aria alludes to in the dungeon before entering.
(5) I want to see the Goddess' breasts 😭