The premise will be your character/ship/robot is in an area fight to the death against another character/ship/robot. You will have weapons at your command from a shotgun to a laser that can blast shields away. Your method of movement will be a grappling hook that you can throw into the sides of the map and any walls inside the map, hopefully you will be able to grapple your opponent as well. There will also be defensive abilitys such as a mirror shield that will reflect lasers, but will shatter if hit by anything else. A rubber shield that will reflect bullet weapons away, but dies instantly to a laser or explosive.
Hopefully with multiplayer connectivity as well, but thats once the game is working correctly. I am also considering allowing players to break the grappling hook chains causing their opponent to stop moving until they recast their grappling hook. Probably with a shot from a laser or multiple impacts from bullets. Ideas? Comments? Weapons you want to see?