The design of this game is beautiful and coherent. It feels like a very unique style, and it is gorgeous to watch the style flesh out and build to greater complexity with each level.
The lighting is also well executed.
In terms of gameplay, it would be cool to have a different goal in each scene. Could be trying to find clues about where the cat is in the first and second scenes (e.g. scene 1 you pick up clues as you walk around (or materials needed to find your cat/leave your house, e.g. torch, cat collar, keys, phone), scene 2 you speak to NPC who hints that the cat went to the forest and likes fish), and in scene 3 you have to get to the river and fish for food to get your cat back. Only after you've successfully collected clues and spoken to the NPC does the forest become available, and only after you've fished a given number of fish can you find your cat. This would give the game a more developed and engrossing storyline that matched the complexity of your graphics.