You, an Astronaut is a very different kind of game. Like another of the commenters on the game page, I was initially confused by the format. Sure, it's an interactive story but there isn't much to do beyond choose from some preset options. But where the game shines is in the layout of those options. The choices you make are thought-provoking and freeform to the point of being revelatory about yourself. When presented with multiple options, are you allowed to pick more than one? All of them? What happens if you are drawn to contradictory choices? There is no one there to tell you what the rules are, so you have to make them up yourself, if you even want to have rules.
The best part about the game might be the ending. Without giving anything away, the introduction of a new voice to the world really hits hard. It's unexpected, just as jarring in-game as out-of-game. And the open-ended final question, with no options presented? Fantastic. Even with a new voice present, the game ends with just you. An astronaut.