Really love the art style for this game, and the music you have made complements both the theme and the art style nicely! Concept-wise, I love this idea, almost like the pet is helping their owner go through something like depression.
However, I have no idea how to actually properly take care of them. It feels like there is not enough food in the level to keep them fed till 8pm. I would also have loved if there was a way for the cat to interact with the human, like playing around or petting, to increase their happiness.
All in all, I love this game, but wish there was more to it. If you ever expand on this idea, I would love to play a more complete version!