Very neat
Gameplay was repetitive, but I played the whole thing to find out what the hell was going on, and I found all the 3 endings. Connecting them you can get a pretty good idea of what happened, it's pretty detailed although other people don't think so.
As mentioned above, this game is focused on story and not on gameplay, and this can be a good idea depending on what you want your game to be, but highlighting the dull gameplay by making people play the same thing over and over to get all the endings just isn't fun. I really enjoyed it, it was one of the most interesting thing I've ever played on the internet, but that "continue" button could have been used in a better way, for example it could redirect you to the moment when you get the hover thing, so that you can get every ending in less time (and without having to re-light the power plant, re-learn double jump and stuff).
Overall, a very good game. I gave it 5/5 because it was really interesting and the essential art make the story look even more prominent, but that thing about playing it again is painful.