Amazingly good level. I've never before spent 15 minutes on a level and when I got to the end thought "It's over already? I wish there was more!"
I very much appreciate the unique tone of the level. Abandoned levels in video games are usually dark, eerie, and foreboding. It's refreshing to see a level of this sort that is lonely, but also bright & cheery. It has a sort of welcoming, but quiet, atmosphere that makes it seem like the level is inviting you to explore it.
I still need to find that secret level though...