I want a stream of enemies coming from the top of the screen one behind other in a line, with their speed (speed of the whole stream i.e. every enemy) increased over time.
When I simply increased their speed, a continuous stream of balls (which will be my enemies) is lost since objects are spawned at a fixed time interval irrespective of the varying speeds of the spawned balls.
To maintain the continuous flow of balls what I wanted is to generate balls rapidly as the speed increases. So there should be a direct relationship between spawning interval and speed of the stream.
How can I do that?