If there was a key explaining what the colors meant that would be great. And maybe the option to select colors or pick between a couple of alternatives - i think in western culture green is good but in Chinese i think they normally think of red as the best - just being able to swap between those two defaults would probably be enough - thanks for your hard work - much appreciated

the color allocation is closer to chinese symbolism than western. You don't need to change it, just describe it somewhere, probably with a rainbow strip, maybe bottom right, like a scale symbol on a map.