There's a lot of existenalist tropes to be sure, with a heavy anime filter. The primary theme is: If you were religious and found out God is dead(and had been dead for a long time), what do you do now? Most of the game seems to be dedicated to exploring this, even if it's often silly(Robots run an amusement park...for themselves I guess?).The story was kind of obtuse, and I'll admit I don't entirely get it. Something about nihilism, but I'm not really sure what the point of playing through the game 3 times was, other than to maximize asset reuse. The characters other than 9S were uniformly flat. I did end up doing most of the side-quests and did enjoy some of them, most were busywork though.