Found two endings; kind of disappointed in the lack of either of them being exciting; but alright puzzle game. Only lingering question now is: What's the point of the gameboy?
[Spoilers]
Endings found:
1. Log off (or die) after reaching 4-1 at least once; in meatspace find that there's a place you can just walk away from everything.
2. Reach 5-5 (I think it is) where you see yourself in meatspace from cyberspace and have left the key from the frog's stash in that room. Pick yourself up and find a door behind you that the key will work on.
Also:
The computer says not to exceed 1000% Compey compacity; but if you do this you just get infinite lives and can only leave by logging off or destroying the computer in 5-5.