Also have to say I like this game. Too bad it was never made into a full game (as in a longer game, right now it is very short and does not feel like full experience).
I think that's almost my favorite part -- it does its thing very well, very briefly, and then leaves you wanting more. It's a nice change of pace in the age of games that take a whole weekend (or more) to complete.
also, Michaël -- where did you get stuck? I found it to be a charmingly self-explanatory game right up until the flagpole jumping bit (which IMO was a questionable design decision, and one which I noclip-ed through without a twinge of guilt).