Great Minigame! One Thing though, instead of having the middle as "Killer" make it teleport the balls into a tube with the top meaning 1st 2nd and 3rd it could make a good "leg/part" for a marble run or the finishing results also have a few more stuff in the way before the middle!
Great game Very unique but try making it so the barrel of the gun cant aim straight down but at least you made it so it cant shoot through the truck XD "guessing the gun is a laser" any ways could make a great game once fully done.