As you might expect from the co-creator of Rick and Morty (Justin Roiland) this show is just chock-full of good, funny and strange sci-fi ideas.
I could watch the aliens for ever, but what I found most interesting was The Wall. We see a few bits of this in a couple of episodes but episode 7 is all about The Wall. Many people have noted the emotional content of the start of Disney's Up - I think The Wall episode scores highly there too. Analysis have also said that some (a lot of?) sci-fi is not about science, advanced technology or aliens but it is about our humanity - you can see this too in The Wall episode. An oustanding episode in a very funny series.
I loved it - more please.