Brilliant
A few people referred to the idea of 'one chance' as an aspect or part of this game. It -is- the game. It is because of this concept that the lack of replay functionality enhances the game so thoroughly. With the option to remake all of those choices, the decisions themselves become meaningless. And without meaningful decisions, this game has no substance whatsoever. The mechanics are very simple, and the overt input that drives gameplay is barely there at all. It is pure choice.
The end result of your decisions give the ending weight. As such the lasting experience beyond the game itself becomes your 'replay value', or rather an extension of the experience. If the game isn't being taken seriously, you're not going to get much out of it, and it's established through the mood and gameplay that that is the case.
As gamers, we need to consider that the medium we find ourselves engaged in is very broad. Think of games as 'experiences', whenever a developer makes a game he has a purpose for that game, which is often more than simply entertainment. Yes, I consider games as art. And there's always room in gaming for traditional fps, rpg, rts or whatever takes your fancy. Just try to consider that a game may be trying to communicate more than is immediately obvious. Not doing so makes devs cry. And time spent crying could be spent making more freakin sweet games for us to play.
Right, the game.
Concept was exceptionally strong, and the choices and events presented housed and propelled that concept beautifully. While the audio and visual style were strong enough, they did feel somewhat bare bones and could be made more dynamic to better reflect the choices perhaps. At the same time the stylisation was unintrusive, and really let the message come through cleanly. I appreciated the subtle changes in scenery which really helped convey the passing time and decaying world. An excellent piece of work all round.