Press CTRL + ~ during game play to display the console window, then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CHEAT CODE God mode - /god Set money - /Scrap.SetMoney Set lives - /Scrap.SetSaveVar World frozen except for player - /freeze World unfrozen - /unfreeze Set time speed - /speed No clipping - /free Pause game play - /stop Resume game play - /go Save game - /save Reload game - /reload
During story missions where you must destroy an enemy with a certain amount of lives, save the game after each time you kill them. If you die, reload the game. You will resume the game with full health and they will be missing a life. This works well for fights with the gambler, etc.