Start the game with the command-line parameter "-console" to activate cheat mode. Press ` to bring down the console while playing, then type any of the following cheat codes:
Example: C:ChaserChaser.exe -console

Code - Result:

cht_god - God Mode
cht_armor 100 - 100 Armor
cht_flymode - Fly Mode
cht_health 100 - 100 Health
cht_giveall - Give All
cht_weapon X - Give Weapon X
cht_timescale X - Change Time X