Let Them Come by Tuatara Games
There is a deleted scene in the Aliens film that has the marines fix a motion detector to a mini-gun that proceeds to lay waste to anything that moves. Let Them Come is essentially that scene with the player taking control of a large machine gun as they fight off wave after wave of aliens as they crawl from the right hand side of the screen.
In this episode of The Sausage Factory, Chris talks to developers Tuatara Games about Let Them Come's development.