I like the idea with the secret code to look for. It's making for a more interesting game loop. But I am not fully getting it in action as the player.
I struggle to find out how to cancel out of the computer with the cipher input (playing on WebGL ESC exits fullscreen of the embed). And for solving, at first I thought I have to pick the symbols visible from the rooms the enemy appeared in front, with that same order. But that seems not to be the case. Since I cannot cancel out of the code input I only attempted twice.