Thank you for trying the game out, the game does open with quite a difficult choice and there's a chance the player might miss out on 80% of the content but it's part of making VN fun. Death and choices have consequenses.
The reason for no saving is because we were just trying out our new solution in Unity for making VN and sorts so it is missing some features that Renpy has, and jam is a perfect place to test it out. If we have time in the future we would definitely update the tools and features so you can save.