Cheat mode:

Press "O" to enter the options screen, then enter one of the following 
case-sensitive codes to activate the corresponding cheat function. 
A sound will confirm correct code entry

Code    Result
--------------
NOHIT  - no hit for all the team
MONEY  - adds 1000 money for Hero
HEAL   - heals all the team
AMMO   - infinite ammo and durability for ammo
EXP    - adds 2000 experience

Go to Options Menu (Quick Key O): Hold down Shift while typing one of the 
above, release after typed and you will hear a distinct noise. (hold and 
release shift for every cheat input).