I wanted to catch the cat soo badly! Me encanta los gatos. I like your idea of slowing time down. I also like the screen effect when time is slowing down.
If I had to give feedback I would say add an animation for jump. The spring can be compressed and released when jumping. And with a bit of trail effect it would look great. Also when I fall, an animation to show the failed attempt and a little sand to express sadness. But overall a great jam game!
Also if you decide to work on it a bit more after the jam - do make a tutorial. It wasn't the best experience to close the window to read for how to slow down time.