Cheat Mode
     NOTE:  This  cheat  involves editing a game file. Be sure to make
backup copies before doing this! Go to the config.ini file in the game
folder. Use a text editor to make the following lines look like this:

ActivateGameCheat=1 
ActivateCheatDebugKeys=1 

Then, use any of the following cheats in-game:

Edit enemy speed:            Ctrl + Alt + E
Infinite Turbo:              Ctrl + Alt + O
Lose Current Mission:        Ctrl + W
No Damage:                   Ctrl + Alt + G
Reset Collector Boxes:       Ctrl + Alt + C
Reset help messages:         Ctrl + Alt + M
Set damage multiplier:       Ctrl + Alt + D
Win Current Mission:         Ctrl + T