Hi!

What about worms on really round level? In which every worms have gravitation relate his position? Like this?
http://img80.imageshack.us/img80/9913/ideaxcfpng.jpg
*sorry for my bad English

http://worms2d.info/RubberWorm#Central_gravity_.28black_hole_mode.29

never it is impossible to be assured.

The game Creature Conflict: The Clan Wars had a spherical planet as the playfield.

http://img820.imageshack.us/img820/9232/104160062.jpg

Scrolling and zooming around the planet was really nice and always reminded me of the cover of Populus (http://img36.imageshack.us/img36/1650/272371populouscoverlarg.jpg).

However, it was in 3D, which made long-range shots even more impossible do pull off than in the 3D Worms games, which resulted in mostly short-range, point blank shots and dropping explosives. :-/