To get access to the game console and enable cheats, you need to start 
grom.exe with the command line parameter "-cheat" (To do that you can 
right-click on the game shortcut icon, select properties and enter the
parameter at the end of the string in the target field). 
While in the game you'll be able to access console with [Tab] key and 
enter these cheats.

Code          Result
----------------------
const life  - God mode.
kill enemy  - Kill all enemies.