Many things to point out here, but lets start with the game itself.
-The core mechanic is great! the artwork is nice and the cat designs fit very well.
-As for the difficulty, the game doesnt need to be harder in the sense of adding more cats. but rather by have the cats be more that static objects with occasional animations. having them interact with the world or maybe even just walk around can add so much more depth. In other words, making use of the animations as intended. I liked the scale up in difficulty, having the cats be stationary, then giving them animations was nice, but i just hoped for that little bit more.
-Of course The lack of sound and overly minimalistic UI are present, but that isnt that huge of a problem.
overall this isnt a bad Game! and with a little bit more time it can be a great one. 3/5