Ever played Savage? Two teams grace the playing field, a legion of humans and a horde of beast. One player from each team assumes a leader position over the rest of their race, and plays the game as an RTS. The rest of the team run around doing their commanders bidding (or, more often, not doing it :/). SavageCraft will be set in the same play style, only this time around you will be playing as either a race of technological Space Marines or a horde of Xenomorphs.
The Gauss Rifle is the primary weapon for the Human Marines.