Spoilers(?):
I managed to reach the normal ending of the game, where you pass through the magenta-colored cathedral area (very well designed and developed) and then go into the outdoor daylight forest area with the big sign that says "the end" and "try again?".
I also did try to look in every corner and crevice where there would be secret partial URL links that would give more information on the game's narrative and any other secrets hidden in the various levels. I did find the green key card and all the possible partial URLs I could find (not sure about this(?)), which led to finding another ending (probably the true ending) of the game. I managed to reach this other "true" ending, that contained one last partial URL, which did shed more light on this hidden narrative.
And now... I'm not sure if there's actually anything else to look for in the game (any other secret partial URL links or AVI files that I may have missed, that is) (and yes, I know that the "true" ending did say "the-end," (with a hyphen?)) . Not sure if there's any other continuation on the game's narrative as well.
The game overall had left me intrigued as to what the hidden narrative really means/signifies, as well as to what REALLY happened to the supposed DIRUS Software company (probably over-analyzing this part). This experience did also leave me a little uncertain, like I’ve uncovered most or almost all of what’s in the game, but maybe not everything.
Wondering if there are additional clues about the narrative and DIRUS Software, as well as different interpretations of the ending(s)(?). Although, me asking this may or may not also ruin the whole point of keeping this "obscure" game and the software company that developed this game a long-lost mystery as it is (my apologies).
Regardless, I enjoyed this game from start to finish(?) and the low-poly/retro/PSX graphics and SFX is always pleasing to see/experience when playing.