You start out on a Mars research base and everyone around you is fucking dead. You kill a few demons that pop up out of no where. You enter a part of the facility in which you can't pass without a hand scan authorization. You look out the window and see a demon with a jet pack. You find a hand and open the door. You're now in a foundry looking area, basically a system of suspended walkways. Shit tons of orange and brown on the color palette. You find a double barrel shotgun around that time. Enemies appear from over the railing/out of nowhere. Kill them. Basically goes on like that for a while. Pick up a rocket. Mini boss that throws bile missiles at you or some shit. Kill the minions and finish him by grabbing his bile sac and shoving it f an his throat. Explodes. Continue on jumping across grabs until you reach an impass. Jet pack demon shows up. No fight. It ripped off both of the players arms and beat him to death.

Then they said "YOU WANT MORE???"
Cue demo two. You are walking through dark area when you come across freaky red sigils on the ground and blood. Whatever. Continue on killing more minions. I think that's where you get the chainsaw. Don't remember, this was Friday. Second demo ends when you open a big door and 12 foot tall Tauras demon looking fucker screams in your face.