The game looks pretty neat so far. :)
Things I would recommend:
Add sound effects for when a page opens up or when transitioning - it allows the player to become more immersed in the project. Although overlays are useful, they pause the music currently playing which can ruin immersion. Try limiting the use of overlays - you can use layers as menus; you can change the visibility of the layers via Show Layer and Hide Layer. Use transform behaviors to your advantage - For example, you can make a scene fade in and out using an empty object over the scene and changing its color. Again, this is for immersion.