Rocks fell, everyone died.
It was that kinda ending except happier. There was no real catharsis, the cat basically walked down the street and a wormhole portal thing spat out his/her parents cue credits. It's kind of a let down, it's like going into a movie and the good guy says "Don't do bad things!", the baddies say "sure" and the movie ends.
I'm not saying that short is bad but there was no substance to this, you could have easily tacked this onto the first one. It was just so empty, I've seen quick 20 second flashes that focus on the telling of a single joke but at least that had something to it. You really should have just combined this with part 1, it's too small by itself.
It's nice that the cat got reunited with his/her family but at least make the cat earn his/her happy ending. It's a kinda boring story when it's "Cat misses family. Family appears. Cat happy"