I did not watch all the way, but here are some things you can try.
Add a mario style camera follow. At the moment, your camera tracks your player exactly. Take a look at the 2d turorials, One of them talks about implementing a mario brother’s camera follow.
Your aura is very bright, soften it and maybe try a whiter color with more transparency.
You might also deform your ball based on collisions and fast motion.
The example game adds a kind of specular highlight that rotates giving a stronger indication that the ball is rotating rather than gliding I’m not sure I like it but it does help. Perhaps if you deformed the ball or added a bump map it would not be needed
The ball is currently rotating, however - currently it’s being rotated programatically rather than being rotated by affected forces (I am not sure how to change this).