The game is a remake of the old Gorgon for Apple IIe programmed by Nazir Gabelli. It uses keyboard only. You can't use touch on this app. You have to rely on the keyboard to play the game. See the help files within the game using F1 key to know which keys are used to play the game. The game can't be rotated with a device such as a tablet. I recommend playing the game on a PC with bigger screen to enjoy the game to its full potential. It was made by one person in 152 hours with C# and XAML
I admire the work of Nazir Gabelli for what he accomplished at that time.
The goal is to stay alive and save humans from vampires. When you want to move horizontally, you just have to hit the right key and while the ship moves you may move up and down slightly each time you hit an arrow key when the ship moves, it'll stop.
At some point in time, cells fuel power-up will appear and you have 10 seconds to grab it. don't miss it because more you move, and more you'll lose cells fuel but at the same time, if you don't move, you'll be hit by a monster or one of their projectiles !
The fun begins when you get to the Nightmare difficulty and you kill monsters faster then they appear. Don't worry, the monster projectiles have a life time. After a few seconds they'll disappear.
Hope you'll enjoy the game as much as I did making it.