Very smooth
By far the best aspect of this animation is the fluidity of movement. The flowing effect and smooth transformation were really cool, especially in the air. I actually thought the music was the right speed for the movements, but I do agree that the audio-animation relationship was the weakest part. You clearly put together a cool looking animation, and then stuck a song over it so it wouldn't be silent. That is fine, especially if you are just experimenting, but it would be really cool to see more interaction between the music and the animation. I liked how the colors changed when the music changed tempo, but then the style of animation stayed the same so it sort of lost the effect.
Final thought: I liked the simplistic single-color feel, but multiple colors can also be really cool. The colors can probably be added on digitally if you don't want to mix up your clay.
Nice job!