Perhaps Jan Svankmajer is sick of the medium of stop-motion animation which first made him famous. Perhaps he's trying to move into pure filmmaking. And perhaps I shouldn't criticize him for that. He's actually an excellent live-action director as well, which Little Otik (in Czech "Otesanek," "Greedy Guts," the name of an Eastern European fairy tale from which the script is adapted) demonstrates. But I'm not sure he wants to leave stop-motion animation behind. It seems to me more like he wants to use it more often in the film, but he didn't have the money. If you're interested in Svankmajer's work, start with his short stop-motion films, then move to Alice, his version of Alice in Wonderland, and then move to this film and then Faust.
As for the film itself, it's imperfect. Its biggest problem is that it's overlong. There's really not enough meat in it (well, there's enough meat literally). It can move slowly, especially nearer the beginning. Also, the ending is a bit abrupt. Still, there're a lot of great scenes and set pieces. It can also be very funny. It's certainly the most humorous side of Jan Svankmajer that I've seen. 8/10.