Change the backgrounds/skies/falling things during the gameplay
so that it wouldnt be boring, for examle the "tribal" level with always falling leaves and same color sky
Um… change them to what?
What you mean seems to be suggested before. (or it's something similar)
Currently you can customize your own game's background by editing the sprites. See Malevol3nt's post behind the link I gave here.
I meant, change the "leave" debris to "stars", or when youre on a "cheese" map, change the background to what "woods" has. And changing the sky gradiant.
CyberShadow's right, whatever it's changed to will have to be looped and therefore eventually become boring...