Error with my Y axis?

Hello,

I’m creating a game, similar to Space Invaders in a sense, however while my background and enemies are spawning vertically on the Y axis, it isn’t the way that I would like it.

I want my game world, and assets to spawn from top to bottom, rather than bottom to top. Would anyone be willing to assist me on how to fix this error?

That’s only a problem of changing the coordinates to what you want