Dear Esther isn't a video game; it's an barely-interactive movie. You walk around an island and listen to a randomized narrative for a couple hours. It has incredible atmosphere and gorgeous visuals. There is almost no replayability besides changed narrative dialogues. It's worth the same price as buying a movie, no more than $10.
Gone Home is like Dear Esther. It's barely a video game. You walk around a house, listen to diaries and read notes, and explore. There aren't puzzles or monsters. The closest thing to a normal video game are a couple combinations that unlock things. You'll complete it in a few hours at most. It's wonderfully detailed, and the intriguing story is pieced together based on how you explore. Once you complete it, you could replay it with the commentary tracks on, but that's it. Again, it's worth the same price as buying a movie, no more than $10.