I like the comparison between cats and liquids, and having a cat that drastically changes its shape to fit into cracks and stuff is good take on the theme. And the sprites for every form were a good touch! It would be cool to see the cat transform in other ways as well, such as flattening out or slinking into holes. The wall jumping could be a bit unwieldy, but it still felt good to bounce between two walls quickly. With more time, I think this could be a cool action or puzzle platformer, depending on which way you want to lean.