Fantastic aesthetic, and overall pretty fun to play through.
The C.A.T controls are very satisfying to jump around with, but the button layouts (at least for a keyboard) is a little funky. For example using WASD, I had a really hard time attacking while jumping to the right.
One very minor nitpick is that the jump animation is a bit rough, since it seems to just be the running animation in air.
It was a little tough to see where I needed to go. When I ran into this issue with my submission, I had to zoom the camera out. This way the player can see a goal area/platform/collectible that they want to go to and navigate a path to that place instead of the player only being able to see the next platform to jump to without knowing where they're going to eventually end up.
Each room was very well designed, I really enjoyed exploring the area and finding the collectibles, though I didn't come close to getting all of them.