Alien: Isolation delivered where Colonial Marines failed, but if you've been hankering for a more visceral, action-orientated experience in the Alien universe, you could always take a trip back in time and fire up the most venerable title based on the franchise: Alien Versus Predator. It even has a "Classic 2000" edition that makes it compatible with modern operating systems.
As the description over at GOG explains, this version of the game comes with everything from the Gold Edition and Millennium expansion. It's also been brought up to speed with support for DirectX 9.0c and if for some reason you want to play it with a gamepad, it'll happily cooperate with an Xbox 360 controller.
The game is on sale at both GOG and Steam, though the latter store has it for slightly cheaper (depending on how forgiving your bank is about exchange rates and forex fees).
While GOG's offering it for $3.49, Steam has it for $US2.49 (or $2.93 in Australian dollars). Both prices are discounted by 50 per cent. As to which store to purchase it from, I'll leave that decision in your hands!