To create these, I doodled a quick representation of each “trait” a planet can have (e.g. clouds for oxygen, colored land for different types of vegetation, purple blotches for toxic waste, city lights on the night side for population) as a separate layer in Affinity Designer, then exported each layer to SVG as a separate slice. Then in the game, all the code has to do is stack them all up in the same location and set each one’s opacity based on the planet’s stats. Next up: terraforming gameplay!