I suggest using tiles,
just one tile actor can make a whole level!
all you have to do is make all you're different objects that are what you walk on and make them each into an animation,
name the first object image object_01
and continue changing the number to one higher,
then once you have all the images and they are saved,
make your'e ground actor and add the animation as multiple files,
when you make it into a tile the animation will not change so it will be a smaller file size background