To complete the other answer, we tried to prevent relying too much on memorization with the colored lines on the floor: the security room is conveniently placed right next to the entrance of the conference room, which can be found by following the orange line. We wanted the player to realize "oh, well I just need to always follow the orange lines to grab all the items", but that was maybe a bit too hard to convey ^^'.
We'll try to be more careful about that for our next games, thank you again for your comprehensive review =)