they are a good style of game that is probably really tough to make. No story, no words, but it is still engaging and the audience has to figure out what they are actually involved on their own. I am a bit envious that you are getting to experience Inside for the first time right now, that game is absolutely incredible. It isn't just a game, it is a work of art.
There are youtube videos about Inside that go on just about as long as the game does attempting to explain what the story is and for me, it was just as interesting as the game was.