In fact it highlights one of the big truths of graphical games as opposed to text games, which is that alternate paths in graphical games are expensive. Every scene, every variation of a scene, is a tremendous amount of graphics work. This is very gratifying. I can't think of any other graphical game that puts this much work into alternate plotlines and possibilities. Unfortunately and in the midst of all that, I didn't like Lighthouse.
Some pieces fit into place very badly.
In particular, other characters are a real problem. They show up when they feel like it. If you walk into an empty room, there's no way to tell that if you've learned what you need and if you stand in the right spot and if the appropriate witness is present, an enemy will appear who you can defeat. There are irritatingly many of these little plot contrivances. Then there is the interface.