As the new advanced Slither can be played as a subset of a Slither game, you can even try them on Little Golem.
I thought about that, but AFAIK there is no "undo" ability (or is there?), and I can easily imagine someone brainfarting and making an illegal move.
It would be cool if littlegolem would implement this new rule. (And presumably keep the legacy version for those who prefer it, or who want to try both versions to compare them.)