Sweet little game, though very rough around the edges.
First off, gameplay. Moving as the cat actually felt really good! One thing I would do is make the cat jump higher/lower depending on how long you hold the jump button, but that's about it. I didn't like the combat a ton, I think this would've done better as just a platformer, without the added complexity of combat mechanics. Player feedback on hitting an enemy/getting hit is nearly nonexistent, a screenshake or zoom in or particle effect, just anything upon being hit/hitting would be rad. You also need to adjust hitboxes to be wayy smaller, typically you give the player as much room for error as possible without it looking weird.
The art is neat! Don't really have anything to add to that. Music is also decent.
About all I've got to say. Keep gamedeving folks!