I answered your PM. This is a re-paste of that answer here for future readers:
As far as code to make a slither.io snake behavior. I answered a question similar to this before here:
Thead: How to make snake move smoothly ?
Video: https://www.youtube.com/watch?v=1H4jATyCbew
Code: https://github.com/roaminggamer/RG_FreeStuff/raw/master/AskEd/2015/05/followTheLeader.zip
I think you’ll probably be better off coding your own solution, but maybe my code will help you get started.