Yup, their solution was our first thought as well. The biggest problem is half our game is about ordering colors based on the color wheel. So Red Orange Yellow.
That doesn't pose the same challenge if that run corresponds to Square, Circle, Triangle. Trying to remember a sequence based on random shapes seems too unrelated. We'll need to do some tests with color saturation most likely.
In the design phase, you could try Skala Preview. I discovered it recently and it works pretty well to mirror your Photoshop work to your phone and also simulate various colour blindness issues.
Definitely an interesting challenge to solve.