On my first try, I managed to get stuck on a pillar, haha.
The art and sound are both veeeery well done. It's impressive how you composed and produced that soundtrack in a jam's time and made it adaptive to the cat's state.
Though a platformer lends itself very well for it, I like that you included a tutorial; something that's quite often forgotten in a game jam (guilty as charged!), due to the short amount of time.
The section with the lava could've used some extra dynamics in the camera; right now it's a bit of a guess where you have to jump to and that could be frustrating for the player.
As a last point of feedback: I didn't feel the need to change to the buffy cat as much. I ran through the game as the small cat, only changing to the buffy cat when I needed to smash through the gates.
All in all, a great piece of work for such a limited amount of time.