Yes, some users in the past have created editors for their games.
There is a game called "Robo Blue" it is out dated now and I don't think it works on the latest hyperPad versions. But it had a level editor.
The general idea is you would save the position of the blocks placed into the scene by your player, and then "generate" your level by loading the coordinates and moving objects (or spawning objects) into the the saved coordinates.