Lol. I've spent months trying to formulate a perfect answer to that question. Every time someone asks, I start writing the answer and 4-5 hours in I just fall asleep.
I'll try again though. Brevity is the soul of wit, here we go. Save point is whatever you want it to be. It does start out as a story of a man who comes home from an average day at work, sits down in front of the tv and discovers the world is about to end. He soon discovers however that this day is instead the beginning, of a world beyond anything he ever knew existed. It's an interactive fiction product that tackles the most difficult and sought after goal in CYOA history. the idea of true freedom. I loved those books growing up in grade school, but they all had a similar failing. Due to constraints of the medium, you could make choices, but they all ended up leading to a similar outcome.
One day I came across a single book that didn't follow those default rules, it was called "The Cereal Box Adventures"
Unlike all the other choose your own adventure books, this book did not give you the choice of going to the north side of pirate island or the northeast side of pirate island. It just spiraled out into whatever.
You woke up in the morning and made a bowl of cereal, and while you were eating breakfast, you read the many advertisements on the back of the cereal box. Depending on which of these you focused on, your day began to take a series of unusual turns. You could read the book one time, and get drafted into the army and end up fighting in a war. You could read it another time and end up on a mission to outer space. It really let your choices matter, though no one story was very long.
So as briefly as I can put it, that's what Save Point is about. The idea of choice driven fiction that doesn't limit itself. It spreads out and replicates like a virus, with no central direction.
If I had to explain why I think this is a good idea, that would take another 10,000 words. It sounds impossible, and it was, but some things have changed and I don't think it is anymore.
Hopefully no one is more confused than when I started, lol.