Not sure what kind of emotional depth you want to see in your yuri title. Do you want Michael Bay level drama explosions, stomach-churning roller coaster of emotional manipulations, interesting philosophical views injected at random intervals, a peculiar backdrop featuring something completely out of the norm, or something else? In terms of story completion, imho this is already fairly completed from start to finish. The beginning had a decent hook, there was only one snag in the relationship that was repaired responsibly, and a cute finish that's very yuri.