In the immortal words of the Linda in Evil Dead our aliens now can say 'I can seeeee you', our little aliens now have their line of sight algorithm in place meaning if you are in their sight they can see you. This adds to the realism of the game for example some monsters will have a limited field of view this helps as you could sneak around them but others have a full 360 degree field of view making them impossible to sneak up on.
I have also added a system in place where aliens can now exhibit rudimentary intelligence, I want them to be believable in the game when they attack the player this will make the whole game a much more immersive experience.
Myself and Emm have also worked out the different types of creatures you will meet in the game from ship crew to the monsters in there, this adds to the realism and immersion of the game itself after all its much more of a game when you come across someone you actually care for rather than 'its just another pixel'. Its always a good idea to flesh out a back story for these games as well as that will also add to the tension :)