I really enjoyed the animation, the first story was the most interesting of the 3 by far. I was interested in why certain things happened and why the builder did what he did (trying not to spoil).
I wish the two other stories would have branched off the first one to help develop a singular story. Waiting for the last story to finish was so boring, it felt like I was waiting for something to happen, but nothing did. There was probably some meaning behind the last two stories, but I felt like I understood the first story much better simply because I was interested in the story.