Regarding the vote.  Personally, I would not have any of the players die, but instead leave that to the NPCs.  However, I would say that I would approve of 'death due to massive trauma'.  IE, if a character's HP drops lower than half their HP below zero, they're dead.  So, if an HP 10 person's HP dropped to -5 or below, they're toast.  Higher, they either need a medlab, or they're incapacitated for the rest of the mission.<br/><br/>As for 'everyone dies'...that's not really an Alien thing - check the source material.  At least one person has survived at the end of the movies, and I know that multiple people survive in the books.<br/><br/>Word being - there has to be at least 1 survivor.