A lot of people are commenting on how this "notgame" challenges their moral convictions and whatnot, but for me it sort of fell flat. I mean, of course you're not going to shoot the guy. Unless you're in detached "this is just a video game" mode, no sane person is just going to randomly shoot a guy that they don't even know. The message about Cambodia is a valid one, but the experience gives nothing new. Especially with the grating music on. I'm glad I played with ambient noises the first time round.
All in all "The Killer" is... well, underwhelming. If the only question I have to ask myself to know what kind of a person I am is "Will I shoot this guy whom I forced to march for two days?", life is a lot less complicated than I thought. The pretense of art does not automatically give something value.