Here's two example for parallax scrolling in 2d mode (ortho camera)

Two examples, one with only 1 layer cloned 5 times,
and another one with 4 layer already placed on the scene.

You can only move left/right and no physics are used

Blender files included

• Project : OrthoParallaxScrolling
• Lua script only : 1Layer
• Lua Script only : 4Layers

Graphics used from OGA :
Depth tutorial
Castle Platformer