Up and down arrow keys to navigate the menus, enter to select an option. 'Settings' does not currently work. There is no difference between the difficulties as of this project. WASD to move the 'player' sprite, left and right arrow keys to move the 'AIM' sprite, down arrow to fire. Currently working on: Player health. (Not really.)
I may finish this on my new account, so you could consider this a demo.