I typically add links back to NG in my games, but they still get shared around. I've had folks crop out the NG logo from the cover image before but now I make sure it's in a spot where they'll be forced to crop off a major part of the image if they want to remove it.
Always give me a chuckle when I see FreeWorldGames or Flonga featuring one of my games with a big ol' NG logo slapped right on the right, all the while touting that THEY have the best games on the net. Nothing you can really do about it though, and beyond having logos removed I don't really mind if things get shared.
I've interacted with some people in their comments section who I never would have met and never would have played my games otherwise so it's all good
Zero2562130
Yeah, welcome to the world of online Flash game development, unfortunately; not much you can do about it.
However, watermarking your work does somewhat mitigate such hotlinking; the dev for the Megaman X Next game here did so by writing at the start of the game "This version is only for Newgrounds/Addictinggames/Minijuegos.com. If you see it anywhere else, report it."
Also, nice job on the game so far. Not sure what you did exactly, or if you even went through with my suggestions, but it's a lot smoother now.
JimGiant
I'm just going to make sure to always add a NG logo in future.
I haven't implemented your suggestion yet. I had a bit of code running on each snake segment for features for features I've decided is never going to be implemented and simplified a few equations.