Yes of course, although I think it depends what your goal is. If the goal is to have the player be creative and write a list of poems, with the game giving inspiration / constraints as well as allowing the player to store and review them (as mothnog suggested below), then yes absolutely. If the goal is to allow the player to write anything they want and have it impact the storyline or poem price based on the content of the poem, I think that is harder to do. The closest I have seen was Doki Doki Literature Club where you write poems and it affects the storyline, but that was not actually writing the poems just choosing themes I believe. I think if you want the player to be able to write anything, and it impacts the story, you could use an AI, maybe like sentiment analysis to understand the emotions. But I have never tried to do that before.