There is no facial movement either when they talk. The one that does move is the most interesting. A small boy appears, and he floats, and spins, and does other more intriguing things. Interacting with him usually triggers the more surreal and enigmatic sequences of the game. Its only small, and in the context of the game makes some sense, but its an odd choice for the only puzzle in the game.
Most sound is via an eclectic musical score.
The downside I think the biggest failing is that visually, despite some brief moments, this is not very interesting to watch. And given that you don't do much, have limited interaction, and make very few real choices, in the end what you are doing is progressing a visual experience. As such, without all those other things, the visual experience needs to be engrossing, and it wasn't. Often it wasn't even very interesting. Certainly much more happens, in the sense that there is a lot more motion on the screen.