This story is all-around beautiful. The connection between capitalism and the cycles of violence in war is beautiful. The acting is beautiful, especially with how much goes into the facial expressions. The pointlessness of all three deaths is beautiful in its tragedy: all of them could have lived. There was no reason for them to be in danger at all, unlike the usual type of self-sacrifice done to protect someone in this show. And yes, obviously Ruby doesn't stay dead, but I still think her death matters here. It was unexpected and random and unnecessary, and reminds the Doctor just how much of the universe is like that.

It also feels very classic of this episode to take place (almost) entirely in one spot. An entire story takes place and the Doctor is maybe 20 feet from the tardis. (Maybe the least running he's ever done tbh). And the contrast of that with the gorgeous space effects just add to the beauty of this episode.