wow this is tough. the shapes/arrows etc fall down the screen so fast. Also due to length of the arrows if I have to change colour quick I always end up changing before the first arrow as gone and dying :(. the concept reminds me of colour switch, If you plan to continue developing this, I'd make all the downward items more consistent in size and shape and definately start them off slow and gradually increase speed as you progress :)
potential here for sure.