Ah, Dear Esther...
It must be said, just to make things perfectly clear, there is NO INTERACTIVITY in the entire "game" besides using WASD to walk around(no run key), and mouse to aim where you are looking. Clicking the mouse button simply zooms in a little bit on whatever you are looking at to examine it more closely. No items, inventory, no puzzles to solve or people to talk to. Not even zombies to run from or combat of any sort, not even a run button for those times you go the wrong way and need to walk back in silence(voices only trigger once per play).
There is a good reason for this, but I cannot explain it here lest I destroy what Dear Esther sets out and does so well.
Dear Esther is not a "game" in the traditional sense. I think the best description of it would be "an activity that allows the player to explore and listen to a very broken man, while trying to make sense of what he is saying, with visuals that help support or add a physical backdrop to the audio." In short, it's a jumbled audio book that you physically walk through at your own pace, that also relies on the scenery and sometimes which route you took through it to support telling it's story.
The fact you walk through it yourself and can choose to look deeper into things you come across helps distinguish it from what a movie can provide, while the otherwise stale lack of interactivity helps keep you from being distracted from the emotional roller coaster the story seeks to convey. The fact most of the lines are randomized helps make each visit unique, while also revealing a bit more about the deeper meaning of Dear Esther as an entity.
The fact you walk through it yourself and can choose to look deeper into things you come across helps distinguish it from what a movie can provide, while the otherwise stale lack of interactivity helps keep you from being distracted from the emotional roller coaster the story seeks to convey. The fact most of the lines are randomized helps make each visit unique, while also revealing a bit more about the deeper meaning of Dear Esther as an entity.