Making a Shoot ‘Em Up Game: Carrot Invader - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 144

Figure 5-21. Movements group
Now because this is all about the invasion, you need the carrots to go down.
Configure it so that the carrots go down by 15 pixels every 10 seconds.
Drag and drop a Timer into the group.Change InitY attribute every 10 seconds
as per Figure 5-22.
Figure 5-22. The invasion
Giving the Impression of Spaceship Movement
Movement is relative. What do I mean by this? Well, you don't need to have the
Spaceship actor move to give an impression of movement. You just need to
have other actors move!