Intruiging, which is the point, I suppose :D
The flick does make me wonder as to its meaning. Though I think the term "confinement" comes off a little intellectually abrasive, as if it were a short film for a college course.
I would also shy away from defining your animation as being "metaphoric" and "meaningful", for it makes one sound pretentious. Not that being pretentious is a bad thing, narrative film is inherently pretentious if it's not a documentary. But it does make one sound as if they think their shit doesn't stink.
Overall it is a very well animated piece that displays some believable emotion through the character's physical performance and manerisms. I have to say I enjoyed it, though I feel that the title raises its nose above the audience a bit.