I tried importing the package into a clean project in Unity 2018.2 and the built scene would not work. When I rolled back to 2017.4.8f1 it worked fine.
ArgumentNullException: Argument cannot be null.
Parameter name: shader
UnityEngine.Material…ctor (UnityEngine.Shader shader) (at C:/buildslave/unity/build/Runtime/Export/Shader.bindings.cs:104)
HoloPlay.Quilt.SetupQuilt () (at Assets/HoloPlay/Core/Scripts/Quilt.cs:377)
HoloPlay.Quilt.ApplyPreset () (at Assets/HoloPlay/Core/Scripts/Quilt.cs:484)
HoloPlay.Quilt.OnValidate () (at Assets/HoloPlay/Core/Scripts/Quilt.cs:270)