Try to make your own modifications to the game. For example, you can notify the player about an invalid move by flashing the background color or the color of the foundation object. You can even add a 3D text to the scene using the ExtrudedTextMesh component. Try to play with different easing modes to make the animations look better.
The properties and functions of the Scene object are visible to the outside world, but they really are implementation details. You can fix that by putting them into an internal QtObject, as we described in Chapter 12, Customization in Qt Quick.