Thanks for playing! I did initially want the balls to collide with one another, and the main reason they don't is simply that I found it too hard to implement the sort of timer solution you describe. In hindsight, given that the size of the ball halves each time (meaning that the two new balls could fit within the diameter of the one you're currently working with) it probably would have been possible to spawn two non-overlapping balls and have them able to collide from the very beginning. If I come back to this I'll definitely make the balls stop moving faster, or at least make it possible to take another shot while they're rolling at an absolute crawl - that's proven to be the main issue with the game is it is now.