Phew, you aren't kidding when you say this is really hard! I was just barely able to open the second card-locked door, after a half dozen attempts, by trying to just dodge bullets and not fire back, and pick up repair complects along the way. It was exciting making it that far and frantically running down hallways, frantically consuming repar complects. But overall the game felt unfair and frustrating. I wish the enemies were more forgiving - maybe a larger hitbox, or slower firing rate, or things like that. So that the challenge of the game can come from more interesting places. Also, on my first attempt, I got confused about which item I had selected, how to use items, and which doors were locked vs. unlocked - a different color for those would be nice.
I appreciate the atmosphere, unsettling that I might be playing as a computer program being attacked by merciless AIs. Are the dark red pushable squares corpses?