I think your original idea was the best Blas. Originality aside, it provides a fast pace, interesting sport. From an in-character stand point it provides the populous a distraction, while not totally having them forget the fighting going on around them.
You should refine how the game field/environment works, as well as the laser's effect.
As for the object of the game, I liked the idea of a land capture system. Meaning someone must hold a location for so long in order to take control of it. For example, say there is a cluster of three asteroids/blocks/whatever in the region, only one of the blocks has a node where the player can access the capture system. After accessing there's a timer counting down until when that region is taken control of. And I think you can guess what the object of the game is, capture and control all of the regions.
Well, that's my two cents. Maybe more suggestions later.