I've now played the demo and I have to say, I was not expecting it to be all that good. It's just brilliant! And the storyline is original and very interesting. It's made me want to buy it to see how the story panes out.
It's got impressive climbing mechanics in the game, smooth, quick and reliable. But for me, this game really shines on the combat mechanics. Theirs no messing around on this game when it comes to combat moves, their just slick and have a real-nice feel to them. The weapon is kinda like a Star Wars Lightsaber, except its a lot better.
Best way to describe this game, its like Uncharted but with much more of an interesting storyline, and without the guns. I would say; I'm more of a fan of shooting based games, so for me to like Melee games like this, it has to be great. A MUST BUY!