Download Twilight of the Gods
Twilight of the Gods is a game that has a solid story behind it, but even if it is not written specifically, you will still be able to understand it from the gameplay. The game will put you in the role of a powerful soldier that has to stop an experiment.
The game will put you face to face with fierce monsters that must be defeated in the military science laboratory where the experiment took place. Things went wrong here and the scientists were killed, but you will still have to work your way out of there as soon as you get in.