Leaf
The leaf event is another event that doesn’t work. It does nothing within the game, although it was probably intended to act as blowing leaves in the Diamondus levels (a similar function to the Snow event, where snowflakes fall down from the sky). By the time the game was more or less completed, the event’s role was superceded by leaves animations in the Diamondus tileset, placed in the foreground layer of the Diamondus levels.