Nice little game, I like the idea of playing cat and how it's related to the Zanga theme, and I'll leave my feedback below.
1- The game resolution is too high for the pixel art style, it would look better on a low-resolution screen, similar to old retro games.
2- The spikes colors are so blended in with the level backgrounds that it can be frustrating.
3- There is a delay or lag sometimes before jumping, which I believe can be fixed with how input is updated in the update logic... Godot also has this issue, which can be fixed by changing the physic to process update for the inputs logic.
The music is wonderful, and I love the artwork.
best of luck.