Period 8. No cheats outside of duplicated inputs. No mechanisms (except the four piston arms) that do not fulfill the same function forever. All instances of touching grass limited to a contained grass touching zone (no snails allowed). Shoutout to the shell that will one day grow to touch snail.
If I have the motivation I may implement an LFSR to randomize the colors of the snail every rotation.

It is reccomended to disable collisons for the smoothest experience.