That was such a creative way to use a narrative in game contex! I feel very inspired to try to create some type of story that uses the respawn aspect of games (or any aspect of gameplay really) as an actual plot device. Or maybe not, I'm quite lazy.
The weakest part has to be the actual puzzle for me, it felt a little too simple and disjointed from the rest of the experience (except when to save christina you have to guide steve to do it, that was a good use of gameplay telling the story).
The music did a great job setting the mood and the art was good, don't have any more commentary on that.