I dont think it would be too awkward, its been well established (i think) that the Aliens have a type of telekinetic from of communication, so essentially, if you are playing as an Alien, you would essentially have conversation options, with other aliens and such. Of course there wouldnt be like secret quests and stuff. But basically you could just take orders from the queen, which could involve taking other aliens and basically killing a load of humans and getting hosts and stuff...one think i would love to see would be an Aliens stealth mission where your on your own and have to avoid detection, and then end up taking like a superior member of the Marines as a host. or even have like two hives in the same area, and you have the choice to either negotiate with them to wipe out the human presence, or just attack them