I like the simplicity. The colours are nice and vibrant. Not really a fan of the music, but it's not bad per se. It seems that you chose to teleport the orbs to some random location on the right with a random speed once they go off the screen on the left, but I think you're doing that a little too early, as I can actually see them disappear when they touch the left edge of the screen. This is a little jarring.