@mcodes and if you do decide to make your goombas move, that’s easy too.
The simplest method is to use the “bounce on wall” flag for sprites:
However, this isn’t true “goomba” behavior because it won’t work for sprites that have gravity. In mario, goombas fall down when they walk off a ledge. To copy that behavior, we can use an “on hit wall” event instead:
There are comments in both those example that explain the code!