To change the serialization method for saving/loading data , go to the Main scene and then select DataManger GameObject , then select any method you want using DataManager component as
Unity: Draw Lines Extra Edition
Is there any limitations on grid size?
You can change the grid size limit from LevelsManager.cs script as the following figure below For more questions, suggestions, comments , feature requests or any problems, don’t hesitate to Contact
How to set up Music clip for my Project ?
You need to assign the Audio Clip reference for your music using the first AudioSource component in AudioSources GameObject as the following figure below : Finally , click on Apply

