Your touch object needs its property "use mouse input" set to yes to use it with a mouse instead.
Also your platform behavior could not execute the simulate action because it was placed/spawned in the middle of a solid object (your tiled background platform was really too huge).
The collision with a tiled background object is set to bounding box by default (the dimensions of the TB, whatever the texture which is inside).
Also it's just a bad idea to have a big blank background. It makes a bigger texture/download size and mobiles won't probably handle it anyway.
Prefer using sprites (smaller ones) in that case.
Also to use efficiently "Clear Background" you have to set the transparency of all your layers to yes (your "BG" atm isn't).
Also : DropBox ^^