@Sasha willems:
As was stated in the initial rules, dogfight was intended just as "2 entities fighiting each other, from bacteria to solar systems.."
I thought that a combat game would have been close enough to the theme..
If the rules were more restrictive, I would have made a fighting-airplanes game too.. Well anyway, forget it

If the game runs slow on some systems, you can disable shadows.
Just have a look at the readme (you'll have to modify settings.cfg)