When Black Birds Fly (2016)

The newest animated film from the creators of Where the Dead Go to Die

Heaven is a beautiful, clean suburban paradise as long as they follow one simple rule: DO NOT communicate with "The Evil One" that dwells on the other side of a giant wall that circles the town. One day after chasing one he discovers a talking kitten with a broken leg a small child crawls through a hole in the wall and meets the Evil One, who attempts to teach him the forbidden knowledge that was previously hidden from them all.