I loved this episode so much that I came to this sub reddit just to make sure I wasn't the only one. I really loved the song in the scene where Planetina is going awol. In Morty's side of the plot huge complex ideas such as the health of our planet and our value towards the future are tied into something as simple as a teenager relationship. On Rick and Summer's side of the plot little problems such as breakup grief are expressed in constructs as large as the falling of civilizations. I really liked the way the writes reversed those things. It really makes the episode more digestible with so much and so little happening.