So I finally got back to Chernobylite tonight, and finished the game. I thought I could get away with not changing any decisions, as all my crew were on Neutral status. Things were going fine until the part where Olivier approaches you just before the final boss fight, and to my surprise, he shot and killed me. So that took me to the death walk and I found I had to get him at Good status to correct the problem. I did change a couple other decisions though, and wound up with Shasko at Good as well, and the rest Neutral.
So I got the good ending on the second try of Heist, but a strange thing happened after the credits. It said I had unlocked Gate of Madness difficulty mode, but I don't see that mode listed on the difficulty sliders. It's still the same as it was before, with Insane being the hardest. I'm wondering if they originally wanted to call the hardest mode Gate of Madness, and changed it to Insane. So I'm thinking it might be an oversight that they left the end game message with it still referring to the hardest mode as Gate of Madness.
Did that happen to you, or did you even notice that end game message?