I love the style of the cats and the characters. I wish the background would also be in this illustrated style so it'd fit better.
Also I think the mechanic with the treats is a fun idea. Makes it feel more like you're playing the story than just reading like usual visual novels!
When I asked the grandma for pets Mimi just said "B" at some point. I don't think thats intended?
But overall a really cute idea. It has cats what else can I say c: