Looks like you had fun making your demo, all good practice. Was enjoyable rolling around and jumping and avoiding the edge to the music.
Next thing I would do is try to deal with the camera clipping into the ground. Keep working on it :)
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I think often one simple way is firing a ray from the ball towards the camera, and see if it collides with anything before reaching the normal camera distance.. if it does, you could move the camera forward to that point.
should be some videos tutorials you can try on youtube :) good luck. If you have a min, please give my game a try and give me a review and feedback thanks