Having a hard time extracting my level

I finished the entire lesson, and so I decided to make my own level: it had everything: the walls and floors, the player, bats, disapearing platform, I added spikes, and respawn points, I played around with the camera to make nice transitions, but when I decided to export it as a mac game, I thought that I only needed to extract the folder:

so I made a new godot project, copy-pasted the Side scroller folder, deleted the practices, and tried to run it, I got 11 errors. it seems that some skins use assets from other folders, and I assume that there is also something in the background which you probably made for the practices.

So I wanted to reach out if there was a way for me to extract my level, all the scenes, and assets so that I could extract the project as a mac game?

here is the zip file if needed:

https://drive.google.com/file/d/1g0pkhfojLpapraj5DXL76VhSs4o47iaI/view?usp=sharing