Hi, English is not my native language, so I hope you won't mind if some typos or grammar issues are in my comment.
I didn't finish Episode 1 yet and didn't notice Luna is 5 years older than Aiden. My thinking is traditional. I think most of men like marrying younger women. Luna makes me think she is too naive to be a 33-year-old woman and a top tier agent. I think Aiden is more mature than her. That is why the age from the introduction makes me feel odd and confused at the very beginning. Besides, Is 33 years too old for an elite agent who usually fights enemy on the front line? If she is 23 years old, it will make more sense in the story. I know you don't want to spoil the story to us, so I have no idea if the age is the foreshadowing or what.
Of course, that's just my two cents and I don't mean to criticize you. FUNS is still a very good game in my opnion. If my comment makes you feel uncomfortable, I sincerely apologize. You mentioned that FUNS would have multiple endings. I am looking forward to beating Vargas's ass.