Overall it's an okay game, I kinda feel that it needs to show some effects for your actions and that some circunstances should be changed a bit:
Let's talk about Eula, rather than she directly fucking the Hilichurls it would make more sense that we feel that we had some sort of impact, for example:
*If we take the mission to destroy the Hilichurls towers, when they have a group of 3 there is a chance that Eula came because of the quest and she is captured (having our MC have the option to save her or watch cause it's hot), if we help her then we both defeat the Hilichurls and nothing happens, if we don't help her then she may start to like having sex with the Hilichurls and if she starts to get addicted to them is when the talk with Amber happens.
-Bond should be a stat that should move more, be it by gaining it (having sex/interacting with the heroine) or losing it (others having sex with her, except threesomes), even more it would be nice to have an additional relationship stat (basically for when two characters are together in a relationship) this is because in some relationships the characters will be much less likely to have sex with the MC unless some circunstances happen (we getting a rent from Mona, the sexy kind or when certain events happen such as what happens between Eula and the Hilichurls).
-It would be nice to be able at some point to not talk to the treasure hoarders to get the money but rather they directly send it to you, it can be a bit repetitive, also becoming the treasure hoarders queen should have both benefits and demerits, the benefit being to get money from them, the demerit being that Lumine will have to negotiate with Diluc.
-It would be interesting to have some investments that would generate passive income, it would help the players quite a bit not having to grind so much.
-Mona getting used to her job and even enjoying it if we take too long to buy her house back, having an effect of she still working as a prostitute even when she doesn't need to and taking away the bond penalty for when she is having sex with the treasure hoarders.