luckypig hum , you know i played and followed this game since the beginning , well to be honest A.O.A was the second VN game i ever played and i fell in love with the genre because of A.O.A .. and have been playing vn's since then , i dont know and never talked to "TLG" itself , but i saw a lot of his posts on patreon at the time. Honesty i would love to see the ending of it and TLG had confirmed on patreon post that Chapter 6 would be the last chapter of the game , he also had already the party scenes worked out , he was just finishing up the endings with each girls , but unfortunately we never got to that.
My suggestion if you plan on finishing like he would on chapter 6 or even taking the story further , is that you just have to think about the party that the Mc is going with Jenny and about the execution of her brother , after that i think he would hit us with the "happy endings" with each different girl and stuff . I think the hard part is to figure out how the party would went , because the endings you can just make it whatever.
Is also sad for the fact that he changed a lot of the story because of the patreons that were bothering him a lot because of the lack of sex scenes , he made a sad post one time saying he was sad how the story was going because of the patreons keep bothering him about that and he had to change a bit of the story to "please" the patreons , because he wanted to create a "slow burn" game , where you had to build your trust with the girls and stuff like that.
Thats all i can remember from back in the days posts from his patreon.
Now for your question about the "dead" guy from spotify , i dont know him, but he has a channel on youtube with the same name with a hundreds of vn's soundtracks , so he is just a fan of the genre i could say.
Anyway i think thats all i can think of , if you plan on finishing or continuing the story , i wish you a good luck.
