F12 activates the cheat mode, you'll have infinite health, but afaik not endurance, so you might still be raped locked in the end.
You can also repeat the same level over and over again, gain money and levels so you can buy better gear (move right or left when you're in the screen to select your next mission).
I've attached my savegames; you need to move them in the 'save' folder of NonoCrisis and change the file's names from "save1_1.txt" and "save1_2.txt" to "save1_1" "save1_2". I enjoyed actually playing the game, so I've a lot of money and you can easily buy the best equipment.