Start the game with the command line parameter - console. Just make a shortcut on your desktop and right click the properties to edit like this:
C:\Chaser\Chaser.exe -console
Now press ~ and enter one of the following codes at the console window:
\? - show Commands
\cht_god - Invincibility
\cht_armor 100 - get 100 Armor
\cht_flymode - Flight Mode
\cht_health 100 - 100 Health
\cht_giveall - give All
\cht_weapon X - give Weapon X
\cht_timescale X - change Time X