Thank you for your contribution @onepice.
After analyzing your tutorial we suggest the following:

• At the end of the game there is an alert asking if you want to play again. If you click the cancel button the alert appears again. We suggest that the cancel button close the game window.

• You could put the variable foodControl as Boolean.

• The snake game area is not visible on smaller screens.
  Put your page with responsive gaming (visible to all devices and resolutions).
  See how it appears on my screen:

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