Its a post apocalyptic nightmare! And if you can't sneak your way through the onslaughts of monsters and murder you're gonna have to go guns blazing as you scour the ruined city scape for weapons upgrades and keys to unlock yourself from this drudgery.
Use WASD keys to move and your mouse to aim and shoot.
Q key turns on A built in Hazard detector.
1-4 Keys allow you to toggle through different weapons
G key lets you throw grenades.
And beware, for your enemies can hear you even if they can't see you!
Space bar key lets you interact with in game objects like keys and doors.