Thank you for your contribution! Excellent/creative idea to bring the classic snake game to 3D.

1. I would expect unit tests to cover the behavior of snake movements and others.
2. I think you can simplify the logics of move() a lot if you use a double-ended queue to represent the body, in your case, the seg. Read more details at: How to Design a Snake Game? i.e. you don't move the tails, you pop one from tail, and add a new one to the front.
3. many magic numbers need to be defined as constants.

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