Difference between tech demo and Penumbra?

[Abysmal]

The Tech demo was a new technology being showed off to show proof of concept. (correct me if im wrong please, team)

The story is pretty much the same in overture, but the environment is different and everything has changed from the demo for the most part.

Of course there are some similarities... such as, both have a flashlight, both have the same physics (well of course its the same engine lol) both are horror type games.... etc etc

[quote]Are they the same game, only the tech demo is incomplete?p/quote]
No.

Like Thomas said, overture is a whole new experience. Read up on teh overture site under "game" for more information.