That thread is neat, I've written down a few recommendations already!
I recently finished Houseki no Kuni, it was very unique. We're following the lives of beings made of gems, trying to live peacefully despite being attacked by strange creatures descending from the moon. The first episodes are light-hearted, but don't let yourself be fooled lol.
I appreciate the growing contrast between the beautiful characters, wholesome interactions and the thickening layer of trauma heaped on the main character. Unfortunately it's adapted from a manga and does not cover the whole plot.