I like it, it reminded me of the old Thief games, it has the atmosphere down pretty well.
I'll mention what everyone else is about the camera and expand on it; The camera in my play through was too sensitive and the y axis was inverted.
I'm one of those that think if I push the mouse forward, I want the camera to tilt up, it tilted down, and it didn't seem like there was any options menu to change it.
Sadly that along with the sensitivity being through the roof made it too difficult to play properly (along with browser issues)
Other than that its pretty well put together.