Good job coming up with two very different, but equally "Halloween" designs for the world. The game looks and sounds great. Although, the world changing sound was a bit intense for how often you hear it.
I have to agree with others though that the controls are pretty floaty. Pressing left or right in the air just launches you in the direction with almost more speed than you get jumping while already moving in that direction, and with enough momentum that I kept sliding of the platforms I was trying to land on.
I switched worlds at the end just as the "You might want to switch worlds" message came up, so I switched back to the "wrong" world, and I think missed the ending cut scene. I just wandered a bit until the end titles came up. (I did replay to get the actual ending though).
Overall a very cute cat game.