A really touching game that I thoroughly enjoyed. The concept of going backwards through your life is really interesting, and complimented by the music that gets less and less complex. The last jump in Level 16 is unfair though. When I died I couldn't tell if I was even close, and only figured that out by using the lanyard to clip through the floor. More checkpoints would have really blended well with the chill atmosphere, as having to go through dialogue multiple times can really degrade there meaning. You probably couldn't have simply removed the lanyard because it was built into the story, but being able to clip through walls adds a lot of unintended depth that I really liked.
Also I though for a second in the white place that Walter meant, there is nothing to the left but that's just me being stupid :P
Keep making games you are amazing at it!