Super cute! I love the visual style, the music track fits the vibe as well. The puns were on laser point.
Writing and theming were nice, but I would be interested in some sort of extra mechanics to help guide me on which door to send the cats through. When I hit 0 and was forced to send all remaining cats to hell, I felt like I made a mistake letting all the prior cats through to heaven!
I felt like a monster banishing cats to hell (until the end)!