Cool simple game if developed more.
You have to download both files because the .pck is basically your data and you should zip the 2 together for 1 download.
But I don't see any Metafab integration unless I missed it?
Also you have a bug with rendering your background images. When you get to the end of one image the next should display a bit earlier it seems.
Even a basic "spike" or something that if you hit you die would suffice for a more complete game