Just move the mouse about.
I wanted to do 32 layers, but I realized that just made it look cluttered so I dedicated layers to individual things. Trying to solve the problem of the blank space in front, I added the caves which look great and are probably my favorite part. It has 27 layers the way it is, and it looks more like full blown fake 3D than a simple parallax effect due to those caves. Inspired by Emerald Hill Zone.