Say Beto, were there any actual flags or secrets put in for pacifist runs?
I know DB and some of these newer players decided to try a no-kills-other-than-the-targets playstyle, but having played through it myself so much, there are basically a few rooms I can think of in the Northwestern end of the palace that are just so obviously begging for a slaughter. I haven't been able to figure out a route through them. Notably, the westernmost Warp Zone you need to carry a key through, the flooded patio, and the one guarded room with a really short timed gate. These specific areas strike me as preventing pacifist playthroughs from continuing - especially that one warp zone. You need at least one kill in there. (I know you have a video of yourself doing the flooded patio, but I swear that is just good luck.)
If only I could still powershuffle my way silently through the palace, ar?
We couldn't make it, since we only managed to implement something to monitor the game on the last days of the project.
What I can say is that for the international version we'll have an achievement system (and try to have only things that are really nice [or at least fun] like killing no one but the targets, or finding the secret easter egg room [that I think no one has reached yet]).
Believe me that it's possible to get through that warp zone unnoticed.
I hint I can give you is to leave the key on the previous room and study the guards' patrol, then go back to pick up the key and sneak past them with their patrols reset.
As for the flooded patio try activating the lever when the leftmost guard is patrolling to the right, then start walking away and after they stop their suspicious time run for the gate and there should be enough time. It's a matter of timing your walking and running.
The room with the lever on the center and four guards on the corners is supposed to be a run-for-your-life to pass with no kills. Also, the only way to do it is to activate the lever from above and be the closest possible to the gate (it's fun to see the gate closing on the guards' noses).