The game is VERY, VERY old, and the first of six in the EDEN series from Forester (later Forst); I don't imagine you'd find the full games online anymore.
The plot: A life-supporting world is discovered under the surface of the moon, along with its sole remaining inhabitant (whom I always referred to as The Licorice Man; imagine a man from the waist up, doubled, then attached at the waist, made of black licorice tentacles). One of the moonbase's few male members, Glenn, is attacked and partially transformed by the lifeform, driving him mad; while the rest of the moonbase crew hunts the lifeform, Glenn stalks and takes his frustrations out on the crew.
As the series progressed, Glenn and the lifeform took their ongoing fight from (IIRC) the moon to a rescue ship to a deep-space transport and finally back to the moon. Glenn's transformations grew steadily more bizarre until he was just a head on a tentacle, and then, THREE heads on THREE tentacles, fighting among themselves over who would rule the empire the delusional little fascist would establish once he reached Earth.
Glenn was hilarious, and the sex scenes were awesome, but like most series that get strung out for five sequels, the story frequently dipped into well-beyond-camp stupidity. Gameplay was simple; as the lifeform or Glenn's POV, you traveled down a path until you ran into someone. You chose to attack or go another direction. Any wrong move (and often attacking someone turned out to be a wrong move) got you killed; try again.
Forester/Forst also made the "Doll" series (beautifully rendered!) and other games. Their old abandoned site (will-game.com/forester) is still active, incredibly!
Oh God, they gave the heroic black kid in EDEN III the worst name ever. EVER.
I don't know about legally, but you can still get all 6 games on hshare (which I did). I used to have them (1-4 and savior) before, but only kept Savior. Also, I havent played any of the games. The movies where in avi/mpg format :P.
Too bad, Forester is dead...... I'm call that so sadly, one of my favorite
FYI, there no need to play the game because there are nothing but click and watch, its not fully interactive like Biko, Artificial Girl
If you think you will expect that gameplay, I suggest just find Eden Video Movie would save your time unless you want the story [which is nothing special there....]
BY THE WAY, Why the hell Eden is widescreen?? this kinda impossible lol