Hey dude, just watched your video and really enjoyed it :)
It's so interesting to see how differently people play the game! Just FYI, you an turn on most lights in the game to save on battery, there is stealth mechanics though, so that eye in the corner near your status bars gives your stealth level. As you spent most of the time in the dark, most enemies cant spot you that well, but I am changing that up now as firing or attacking will now expose your stealth level.
funny you should also mention door codes (oh, btw you dont have to write them down, they are stored in your journal!) I actually thought of randomising them each playthrough a few weeks back, but impliementing that is not trivial, but its on my list of things to do :)
Thanks again for taking the time to make this, really appreciate the support!