Example of the type of interactivity I am trying to create

Look at time: 02:32 - 03:04 on Youtube video below:

Taking a look at this section of a scene on Pottermore explains more or less what I want to do with my own project.

The image fades in and reveals multiple layers, the player can use the mouse (point and click) to advance further into the scene.

The scene also has added interactivity, by hovering over glowing objects the player can either "collect" them or click them to reveal information.