We need more than just hue or saturation differences. Otherwise for us colour blind players there was no difference.
However I'm resigned to believe there is no hope for us as they have been "aware of the inaccessibility" for years now. It's a good thing this is an entertainment app and not an app that had to go through any real oversight. They would be slammed unbelievably hard for the inaccessibility.
But what do I know, I'm only a developer for an app that is required by law to be accessible to any and all possible users.