Floating box fix

Oh no, I must have overlooked this. If you find the floating box strange as I do and would like to see them on the ground, then change

line 108 in levelloader.py to

                    box = Box(spr.image.get_rect(topleft=pos.xy))


This will only change the visuals and does not change the logic (except, you can crawl beneath the floating box.... :(  )