I just added a save and load system for Angry Birds Maker!!! :D This is for loading your Angry Birds Maker levels only; if you want to create a level, go to: https://scratch.mit.edu/projects/1079177347 I could try to fit the "loading" part in the other project, but copying that project is the easiest way for me, as far as I can tell :)
I have decided to remove the "ground" feature (you were able to move it from the ground whilst editing a level, as well as change its size and direction using keys) because there was an error I couldn't fix :( CREDITS TO: -Rovio for all the Angry Birds images and sounds