Doesn't look like the code is that similar. Doesn't look like copyright has anything to do with it. Does Endoh have a patent? That would of course be a different matter.

I'm not alleging a law was broken -- just that the author should have given credit for inspiration.

The author did give credit for the original in his presentation.

Huh? Where?

I saw something similar in perl years ago. I can't seem to locate it now though so maybe I'm imagining things.

aside from the implementation being completely different and therefore not in violation of copyright, it would be difficult to give credit for something like this where every character is strategically placed.

How about in the bottom corner of the screen? Or in the parent directory, where there's a listing of all the demos?

He has actually given credit on Twitter - https://twitter.com/aemkei/status/379310104409296896

It looks to be a different implementation.