That was an entirely useless diatribe on fun that has no bearing on this conversation.
Pardon me for giving my two cents in two sentences rather than going on a 10 minute rant worth of pseudo-academic sounding details on "fun".
So, for you who likes to nit pick and sound smarter than everyone else, let me elaborate in another sentence or two:
For the game which this guy is talking about making, I believe he's going to have to take a slightly different approach to the design. Where Dear Esther and similar games like Dinner Date were interesting, a similar artistic style without other core game mechanics would probably cause a game like the one he's thinking of making to suffer. Simply put, there's a reason why games built purely on exploration, such as Dear Esther, aren't particularly popular. He'll probably have to elaborate on something somehow.
Now if you're done being a nit pickery of an troll (yes, whatever you're about to argue about what I just said, I already know. But again, I made a statement in a couple sentences, not a dissertation for your enjoyment) we can all move on and have a nice day with the quite easy and simple understanding of what both of us are trying to say.