I haven't played the game yet but speaking from experience if higher difficulty = Frustrations then that's not a good system. The idea of different save systems sounds good. Reminds of the original scp game where in euclid you were able to save with the f5 button when ever u wanted to and in Keter (the more difficult one) you are only allowed to save in certain locations but that can lead to frustrations and also soft locks (same with the save when ever u want option of course). So for this game I would say maybe even though we aren't a jedi maybe one of the save mechanics could be meditating or something like that. Or using a data key on terminal to "hack into the system and get access to files" as in you actually put a save file in there. There's a lot of options you could think of.