Nice work! I know from the Steam forum that you only recently started using Godot, so you've shown that you understand it quite well already :)
The gameplay is simple but still funny, and right in the theme ;) I was a bit puzzled by the mouse (device) controls though, the first few times I played the game I had the feeling that mouse controls were completely broken, and ended up playing with the keyboard. Then I read the source code and realised that once needs to press and hold the left mouse button to "drag" the cat towards a direction, which indeed works fine. It would be good to make it clearer in the game.
Congrats on the very detailed credits in the LICENSE file too! The only missing thing is the actual license of your own code; as you're using GPL'ed code I guess your original code should be GPL'ed too.