Was a bit unclear of what to do at first, but soon figured it out. I think this is an interesting concept, that can be improved with some more feedback to the user. For example, when the black ball disappears after a certain amount of time, there's no difference in its exit than when it hits the ball. Maybe like an explosion or something when it hits the red ball would help, and maybe like an extra point when the black ball disappears on its own. Nice concept!