Easier difficulty level:
Use any text editor to open the "perfoptions.ini" file found in the game folder. Change the "DIFFICULTY_SCALE = 1.00" line to "DIFFICULTY_SCALE = 0.00". Save the file and start the game.

Thanks to Revolution readers Skiff, Andreas Larsson, _RaW_, DARKTROOPER, mitch depaepe, and Alexio!