The story concept is nice, albeit a bit disturbing. It's a bit hard to sneak past the guards or assassinate them as it felt as though they turned at random intervals, rather than fixed intervals. I'm not exactly fond of "touchdeath" games, especially without the option to save although I understand this was a short game. The problem was rewatching the entire intro everytime I had to restart or to try for a different ending. Maybe you can make an option to skip the intro?
Good job with the game. I appreciate the English translation, although I would suggest trying to fix the script more (I understand it's really hard to translate to a different language, regardless).