Download Alien Exterminator
On the space station where you have been working for a while, aliens appeared and they do not come with peace. Instead, they will to their best to kill everyone and they almost did it, but you are still alive and you will have to clear the space ship of these beings.
The game is designed with 3D Gamemaker and it looks pretty nice, the aliens are weird as they have four hands, but the overall feeling of the game is pretty nice. You will have some trouble at some points but you will have to keep on going to succeed.