Project size

Hey my english is not so good, i have a question regarding the project size.

I have loaded into my project all the assets I need.

If I now pack my project as Shipping.

Then it’s 3GB. Although I have nothing else left my assets and my materials.

Will it get bigger when I create the maps? Or stay the 3GB to the end?

It is supposed to be a short game.

For this I find 3GB something much

What do you all mean?