Time is important

Before this was only beatable on day 13 unless you cheesed your way through.

Now, instead of gating the player by requiring them to finish a certain longer side quest, every single side quest gives you some sort of stat buff, there are much higher max stats and the final mission is a bit more random and lethal as a result of it.

But it also means that you can win on Day 8 if you know what you're doing during the final mission!