(Average+) Vivy: Fluorite Eye's Song

Series in one sentence:
Hatsune Miku wants everyone to not die, just so she has an audience.

Series in more sentences:
A simple theme park robot is one day hacked by foreign software, who claims to come from the future and in need of her assistance stopping the war between humans and AI, expected to happen in 100 years.
Though not built for the task, Vivy is able to turn her directive of "making everyone happy with her singing" into the desire to protect and joins the strange robot, Matsumoto, on this quest of sabotaging their own kind's evolution.

An interesting story, many dramatic turns, not even the ending feels like much of an accomplishment, but I would've liked the series more if it weren't for all these characters and their confusing reasoning for why they did what they did.

None of the "changes" that Vivy and her partner make in the timeline are much of changes at all, yet square Wheatley calls it a day every time, whereafter he bails on Vivy for literal years until she's needed again. They are given no time to build a relationship, which is fair, they're robots, but we the viewers are not robots. I didn't like these massive time skips much. Wheatley won't even retreat inside her head to haunt her like he did at the start, he just erases himself from existence.
This cube is an absolute failure, he's not even able to figure out why the future refuses to change in any significant way. Maybe because you didn't do anything?

It's also shown that time travel can be done quite casually, no idea how, and so, what stops the villain from time travelling themselves and breaking Vivy in half on her day of birth?
I'm also not sure how the cure for stopping the robots is valid after travelling back in time to a point before that cure was given, because this cure is basically (or should be) the villain having added a string of code to all rampaging AI that allows them to pick up on the "cure", done so after the villain spoke with Vivy. Not a string of code applied to Vivy. There are many plot holes like these in the series.

..Square Wheatley also sounded alot like Kurosensei from Assassination Classroom, I could've sworn it was the same voice actor, but only spiritually, I suppose. He also talked way too fast, I struggled a fair bit reading the subtitles at certain times, which matters, because he spews out important information.