The words of the colours give you the order, eg ‘red’, ‘green’.
I'm currently stuck trying to obtain the 100 crystals that, I assume, will come tumbling down the stairs and pass through the conveyor, as the player stands in the activation plate. Am I on the right track?
Yes indeed. All about finding a way to get that total to at least 100, using that activation plate / conveyor. Good luck :)