There is no map change on 'Hostile Appetite' if you complete the Alien campaign and then play the Human component. It's the same map; and your character/class has been swapped from Alien to Human. The only changes made is some geometry has become visible and others hidden during the transition cut-scene. This was done for good reason...
If, while playing as an Alien, you CHOOSE to destroy any health and armor items you find, those items will also be gone and will not respawn when playing as the 'sole survivor'. Depending on how much shit you have fun wrecking as an Alien may just come back to bite you on the bum when you hunt for those items as a Human. Destroy everything, and the mod is very challenging in its Human component.
You also have the added knowledge of knowing *most* of the layout of the map when playing as the Human, which makes sense because you have presumably lived on the colony for a few weeks at the time of the Aliens' assault. You should be familiar with where the canteen, medlab and operations by the time you play as a Human.
So, yes. There is only one level from start to finish. I really pushed the limits on the game engine for this one. lol.
-Windebieste.
