Use the Arrow Keys to move around and [SPACEBAR] to jump.
Use your mouse to look around and Left Click to fire your weapon.
Pressing [P] will pause the game and re-enable your control of the mouse.
Also in the main menu you can click 'Options' to change aspects of the game.
It's your duty to get though all 9 zone's to reach the core of the space station and activate the mainframe lockdown switch!