I like to think that this game's setting is a Post-God one but the world changed as much as if it was a Post-Apocalyptic one and I think these settings mix really well with stories about mental illness/disability/drug addiction/even heartbreak, I don't know why but they just mix well imo.
I can't do music and I don't know how to get royalty-free music, also I don't have the cash to get a musician to make music(this will change eventually), so the best thing I can do is add to the atmosphere and use ambient sounds! It adds a lot!
Also I'm really found of the guards too.