It's not a game, it's a story with no real options or ability to affect the ending. The game is unintuitive - apparently you cannot climb on the moon, and the only things with which you can interact are the sole permissible solutions to each section (Need something to stand on? Scour this room for the only thing you're allowed to move!), which is made slightly easier by the fact that there is only ever one single way to do anything. I.e., every player who has ever played it has done the same exact things.
The base idea of slowly revealing the story and the character make for a disconnecting experience and does so without explanation - you're not amnesiac, the player is just not allowed to know, which prevents you from relating. You are an astronaut sent to save Earth but given no information on how to do it. I know this was the concept, but the concept is stupid.
Save your time and go rewatch Moon or something - half the time, ten times the satisfaction and entertainment.