Downloaded the demo last night and I really like the 'idea'. It has a lot of promise and I love the way the art design, and specifically how colour is used, to indicate objects that you use to progress. It relies heavily on level design and so far, whilst challenging, it isn't super hard.
I like how momentum is important and the fluidity in which you can perform your various moves.
However, even though disarming opponents looks pretty cool, it comes across as nothing more than a timed button event, especially when you press X for a kind of 'bullet time' effect. The shooting is also diabolical and feels somewhat tacked on. It's so light and twitchy that its hard to get any sort of direct hit from distance. Maybe thats intentional as it's blatantly not a shooter and forces you to get 'up close and personal'. Still, i'd like to be able to aim correctly rather than shoot from the hip.
Overall, I think it could be a fantastic game but i'm a little worried that later levels could become extremely complex and a little obscure.