The Alien Conspiracy (PC)

Enter the dimension where war rages endlessly between two ancient alien foes, and now the fate of it all is in your hands. Your arrival awakens a race of friendly grey aliens, and they hope for you to join them in undermining the work of their evil enemies. You must make your way through a series of increasingly complicated and nerve racking levels and steal the blue energy orbs. As you progress in the game, the grey aliens grow to believe that you are the one who will finally tip the balance of power and bring them to a glorious victory.
Their enemies, the "Badaliens", grow increasingly aware that someone is undoing their works and slowly zero in on your identity and ultimately try to use your presence to win the war for themselves.
In each level you must survive attacks by giant robotic enemies, creatures created for only one purpose, to terrify anyone who dares pass through. As you progress through the game you will unlock weapons and abilities, and as you complete each new level, you can enter into alien space to communicate with your alien friends, who give you useful items and information to help you in their quest.

There are four difficulty levels, rated from easy
to impossible, in each level at each difficulty
there is a trophy to collect which unlocks an
interactive model in the trophy room.
As you get you kill counts up, you can unlock
3D-maps of each level, these are in the rooms off the trophy room.
This game makes if fun to be afraid.