Penumbra Overture Trainers

[WindexGlow]

Or, you can alternately edit the .ent files for enemies so they don't damage you (infinite life, since I doubt there's any falls in the game that can kill you)

Edit the save file to give you any amount of items (999 dyn-no-mite)

The only 'hard' one would be infinite flashlight, but you can easily make the glowstick work as though it's a flashlight with a modeling program (it's very easy, you're just making a directional light)