Move mouse to get rid of green and click to make sand. press space for purple. Use red arrows to change colour of the sand. If you want to write your own word click r to clear and then space to draw. Warning if you create your own word/picture you will not be able to play the game. Also you once you have clicked r to get game back you will have to reload tab. Make a rainbow.
thanks to @griffpatch. It seems slightly different from the original other than the colour, oops.
