Thanks for your comments anyway!
About the save files, because it don't like ordinary vn and need to make a lot of options, so don't need to save many times. This is principally because the gameplay don't encourages players to save and load repeatedly to avoid bad results to make the game is too simple, and the game is a bit rougelike, I want to try to create the feeling that always be thoughtful so you can survive.
I can actually make a multi-character save, which means you can play many saves at the same time, but the new save file only be created for a new start.