It's hard to call this a game, really - it's more of an interactive film. But what a film! The surreal and ever-mutable "script" reminds one of Charlie Kaufman and Neil Gaiman works without being an obvious ripoff. And the vector animation is brilliant, hearkening back to the old sega genesis classic Flashback, but far beyond it in execution. The scenes show unprecedented depth and the ambient soundtrack and fx are outstanding. It's the little things, like watching an office floor full of bears head-track your every movement, the fluid shifting of perspectives from character to character, or the subtle shimmer of every appearance of the word Zero on the screen that make this title just so damn interesting.
If you're looking for straightforward action/strategy/puzzles/etc, this title is probably not for you. On the surface, it's perhaps easy to overlook the the unspoken details of this experience - it's very light on exposition. But if you enjoy reading, indie films, and video games as I do, there's a really rewarding experience waiting for you. Let your brain be engaged in the story, and trust me, you'll love it.