I genuinely can't tell if I liked it. It's amazingly animated, and is very interesting, I just don't know what to make of it. If you want the best experience, watch it in a very early Sunday morning with the windows open and no lights on. Here's my very long and unorganized interpretation of the movie:
(SPOILERS)
the whole movie is about life, death, reincarnation, and the nature of violence. Throughout the movie, the cat siblings hurt people, and people hurt them, but it never really affects anyone. The brother kitty pulls a flap on a random cat at the beginning which reveals that she's inflatable. Her friends move on and keep talking. This short moment also introduces the theme of everyone forgetting about you or just not caring. The next example is the circus scene, where the magician (god) cuts up a woman and peices her back togethor. They also slice up the pig and eat him, but he's fine. Same with the rat mask guy, they cut his head open, but he doesn't even bleed since he's a robot. But then there's the flip side of this: in the film's universe, violence never kills you, but you still die of natural causes. Just look at the fish scene, the fish, after being cut up and mutilated, gets back to the water, but after a while, he dies. I think the magician, who is probably a representation of God, constantly reminds the cats of this. He is, I think, trying to dissuade the cats from trying to get the cat sister's soul. He's trying to tell them that ultimately, everyone dies, so her getting her soul back won't matter. God's wrath is also a recurring theme, like when he floods the planet. At the end, he turns time back and forth for them, and shows how everyone eventually dies. The cave at the end that's filled with machines is sort of a purgatory, where they finally find the cat's soul. This represents God's final attempt to stop them: showing them a terrible, soulless world. But they still find comfort in it because of the flower that the sisters soul is in. They keep living no matter what. This feeds into the theme of violence having no consequence in this world. They come back to their house, but all is not well. The family, and eventually the cats blink away into static. The magician won. He's proven his point. The cats have, he decides, lived a long enough life. They die. Not through some bloody, over the top showdown, but with a simple click, and instantly dissappear. Every thing dies, and so do they.