Not finished either, but yeah ... I always make sure to save before a fight.
The whole game is really difficult though, for me at least. Apart from the very first puzzles, I don't think I've managed to solve a single puzzle by myself but had to use a guide to actually finish them. I get about half-way into each puzzle on my own, before hitting a brick wall. I've struggled to understand what the game wants me to do for each puzzle.
The 3rd episode I think, with all of the tubes, was so confusing. And then I think I took one out before I was supposed to and got irreversibly stuck.
That one was very confusing. I restarted that mission many times. I understood I had to do something with the tubes but could not figure out what. I also completely missed a panel or vent. Sometimes in the game, it's not that apparent that you've made a mistake to begin with.
So much about solving puzzles is predicting what the outcome of an action will be, which is challenging enough in mechanical of physical puzzles, but trying to predict futuristic sci-fi logic is quite difficult.