I have bought and played the full game, because I like the Journeys of Reemus Series and other great games by these authors. The game is high quality, funny and moderately challenging as all their games. It contains interesting characters. However I felt it was a little bit too short. The five free games together are slightly longer then the commercial game. The commercial game is made longer by various in game puzzles and mini-games, but it still does not have that feel of length that simply more adventure scenes would provide. The full game also has only one ending unlike the free games that are more nonlinear.
On overall, I do not regret buying the full game, it was fun and interesting, but it could have been a bit longer and nonlinear.