This is very ambitious for a first "complete" game, especially for a game jam. It's very impressive what you managed to put together with the limited time.
As feedback; try to use transitions when changing scenes, it helps a lot with the presentation of a game. Also, it was probably not included due to time constraints but, I would suggest having animations when a cat is defeated. Just a simple dragging off of the screen would help the player visualize what the actual outcome of the battle was, like in the old pokemon games.
Anyways, nice job on delivering this!