The above file will unlock debugging functionality in the game. To use it, simply extract the contents of the file to the bundles folder in your game installation. This will add a "Debug" option in the Pause menu, which will have the following options available:

• Features:
  • Character - Allows you to change Spencer's available skills and powerups. If Arm Visible is turned off, Spencer's bionic arm will not be visible, and you won't be able to use his punching moves. However, you may still use your arm to swing around from place to place if you've got those specific skills available. Keep in mind that the game may freeze if you unlock the Kite skill in the early stages and use it on some debris that the game thinks can be thrown around, like some potted plants in the first level.
  • Weapons - Allows you to change Spencer's weapon bonuses (accuracy, damage and ammo amount.)
  • Matrices - Gives Spencer access to the White, Red and Blue Matrices (doors) without having to complete story sequences. A Green Matrix is also listed, which corresponds to an otherwise unused Matrix in a level.
• Free Flight - A no-clip mode. This freezes the entire game, and you can move the camera around with the gamepad sticks (Left Stick to move around, Right Stick to change the direction the camera is facing) or the mouse and keyboard (WASD to move around, mouse to change where you're looking.) Press A on your 360 pad to teleport Spencer to the camera's current position; this function doesn't seem to be available if you're using a mouse and keyboard. Press Space while using a keyboard to toggle the UI on and off while in this mode. Keep in mind that gravity and environmental hazards will affect you immediately after turning the option off. You can also fall off the map.
• God Mode - Makes you invulnerable to physical damage, radiation, drowning, or other environmental hazards. The enemy can still stun or throw you around, active mines will still knock you off, and you'll still die if you fall in a chasm.
• Give Weapon - Adds the selected weapon to your inventory with full ammunition. If you run out of ammo, using this option will refill your ammo.
• Health Boost - Restores your health.
• Unlock Challenges - Sets all the challenges and collectibles to 100% completion.
• Unlock Levels - Unlocks all levels for use in Level Jump mode.
• Ghost Mode - The enemy won't attack you or react to you. They'll still act like they see you when you first approach them, but they won't do anything even if you attack them.
• HUD:
  • Simple HUD - Makes the HUD vanish.
  • Safe Rect - Unknown.
  • Debug Box - Displays a box in the upper left corner of the screen that shows the stage name, and the coordinates for both the camera and your character. "Camera ray Length" shows the distance from the center of the screen to the object or scenery that your cursor is pointing at.
  • Help swing text - Does not seem to do anything.
  • Show FPS - Does not work.
  • Show Console - Does not work.
• QA Prints - Does not work.
• Sandbox Spawn - This is turned on by default, but its effect is unknown.
• 30 FPS Cap - Locks the game at 30 FPS. The game runs at 60 FPS by default.
• Save - Lets you save the game at any point.
• Quick Respawn - If you die, you respawn at the last point where you had your feet on safe ground without having to wait for the game to reload the stage.
• Adrenaline - Its effect is unknown. Theoretically it would affect your Adrenaline gauge, but it doesn't seem to change anything.

More useful info here.