У вашего броузера проблема в совместимости с HTML5
In this video, I modify the default sprite shader in Unity to create a Sprite Mask Shader.
Link to the Default Sprite Shader: https://github.com/nubick/unity-utils/blob/master/sources/Assets/Scripts/Shaders/Sprites-Default.shader
Use the art I used in this video:
https://opengameart.org/content/winter-birds
https://opengameart.org/users/phantompuffin