If you only played it once without knowing the ending, I strongly recommend a second playthrough. Some dialogues and poems have a wildly different meaning once you know things.

Also, I fully recommend DDLP+ too. The extra stories don't have any real gameplay, but they are really good, and add.some depth to the characters.

I'm not sure I could tolerate a second play through. One part in particular that just goes on and on and on for what feels like forever is really tough to get through and resume the plot.