One thing that I remember well from this game was that when God mode was activated (either from a pickup or by cheating) the character was floating above ground, was invincible, could throw balls of holy light with effect comparable to BFG and, funnily, was yawning all the time from boredom.
Some enemies would pretend to give up and then try to shoot you in the back, there were jumping platforms… this game was epic.
