Thanks for the feedback! As for the longest cycle game mode, the objective is to get the longest, finite cycle, which means infinite cycles don't count. Notice how the score only updates at the end of a cycle.
As for the tutorial, I'll let you in on a secret: I only changed 2 words in the tutorial, and apparently they made the world in understanding the gameplay. I changed "Even numbers split, giving one half to each of their neighbours" to "Even numbers split in half, giving one half to each of their neighbours", and apparently the extra 2 words "in half" was all that I really needed to add. Fascinating how much of a difference those 2 words made.