Game seems completely based around exploring, which sure a lot of people can find fun, but the big difference here is that it's all procedural generated areas, the developers haven't designed the look and feel for it, only the base line so it can put something together, which to me takes out the beauty of the world, cause you may (and I can more or less guarantee this will happen to at least one person) just get one rubbish looking world after another, and the truly beautiful ones will be a dim in a dozen.
You can't really judge a game until it's out so there's that, but I imagine people will get bored of this game very quickly.