I'm 150hours into the game and just recently discovered that if you leave the game during a fight and continue, the fight will start from the beginning. At first I was like "OMG NO! Now that I know a way of cheating I will always be tempted to do so if I fail!" Than I thought about it longer and I came to a different conclusion:

Firstly, this feature is GREAT as a undo ability if you click something by mistake. And be honest, we have all played that one fatal card that ended our A20 Run at the last boss.

But more important: this is actually an immense effective way to improve your skills. If you see you will lose a fight on the next turn, you often think "what did I do wrong? Was there a chance to win this fight?" - well, go try it out and restart the fight. All random elements will result the same (fixed seed) and you can practice this fight to see what you did wrong. You could even ask an experienced player to help you see your mistakes.

Yes, your Winrate will be better if you keep doing this but cmon, it's a single player game, why should you be cheating yourself. I'm running an excel sheet with all my games and if I savescum I count this game as a loss but keep on trying to win it, anyways. This helped me a lot to improve.

Feel free to argue with me :)