Subject, Skills, and Grade Level
It helps with teaching about creativity, story-telling, playing a role and writing poems. I feel it is most appropiate for grades that are currently learning about poems in Literature/Language classes (or the equivalent to said class in your country). Here in Chile for example, it would be most adequate around 3° Basico onwards (AKA 8 year old students or older)

Time & Players
15-30 minutes in average; The game is originally set to be played by only one player at a time, but I feel it's possible to make the whole class write a poem at the same time too (as in, as if they were playing separate sessions but helping each other too; Sorry if I'm bad at explaining myself).

Rules, Tools, & Assessment
The game is GM-less and can be played alone. You need something to write the poem in (such as a pencil and a notebook/piece of paper).