Well, it's not an arcade game with focus on points/high scores/levels etc (some people seem to think it is), rather the opposite actually. No UI, no dialogue, no long-winded tutorial telling you what to do. It's more of an experience, without falling too far into the artsy territory. There's kind of a story in there too. And part of the experience is not knowing, but finding out on your own (which makes it a bit hard to properly explain it without giving too much away). It's not that long though, so it's not a huge commitment to get through.
