A few things could have made this a nicer game IMHO: 1) Maybe add something to do with the rainbow (hit something, collect something?) 2) The rainbow is so dark that at first I thought it was black. Then I really squinted and I realized there are some colors in the black. Bright and colorful would have been much nicer. 3) An option to go full screen, or at least a larger screen size. 4) Some indication that the rainbow is actually created by us. There is some delay between when I hit the button and when the rainbow starts being drawn. At first, it felt to me that the game draws the rainbow on its own.