I may be the only one to comment on this or even notice it, but I'm re-reading it and I absolutely love the salad in the first meal being purple. I assume it's based on the purple Earth hypothesis involving retinal as a simpler form of chlorophyll. One thing I do wonder about, and I was thinking about it in my original read-through as well, is whether there would then be green plants in the background instead of them all being purple. I assume it would depend on whether plants are working their way towards chlorophyll. That red and blue light is more prominent than green and yellow, but chlorophyll has yet to appear as an adaptive mutation in all plants. You could even establish economic values around this, where green plants, plants with chlorophyll, are more valuable for their rarity. After all, the hypothesis is that chlorophyll only existed as an adaptation to the sheer overwhelming volume of retinal that was hogging all the yellow-green light in the sea.
Or, absolutely none of this matters for the sake of the game and I'm just being too detailed.
Edit: I actually just saw more plants and I'm seeing that they're both purple and green. I assume that's just an artistic choice? Since both chlorophyll and retinal wouldn't be found in the same plant