Those actually weren't intended to be windows but lights, I was initially using the pure white blocks in the train station tileset as the background for the image and put some of the cascading light from the same tileset over the top but it seemed too bright so I used the window image instead which I'm sure wasn't as effective at conveying what I thought.
Usually I spend a lot more trying to go revise things but I wanted to at least keep it in some kind of relative connection to being a type of jam-type thing which I think is what that Knytt of the month thing represents. I gave up on doing a lot of things because I tend to just get stuck and revise forever if I don't. Like the end was supposed to be an area that you climb out of with the light emanating from a hole you climb which would be the exit with the ending cutscene but after a few tries at using the tileset "quite the hills" and having light come out of it, I could just never get it to look right so I just made it become white.
The map thing is there because I started doing the map and gave up because halfway through I realized it's a completely linear level with only one secret screen to it so there was no reason for a map. I can tell you when I gave up, it was at the point where you climb because everything there would be offset by 1 on the map and I was feeling super lazy about having to redefine the map position for every single screen after that fact. So lazy, in fact, that I apparently lacked the energy to disable the map after I gave up on making it.
I may revise this slightly to change the value of the sub tints on areas that are darker than the rest (though it's still intentionally "too dark"). And it never even occurred to me that someone might use the map so I guess I'll just complete it because it's close enough to being complete. I expected there to be things I needed to change and that's why I haven't uploaded it to Knyttlevels yet.
EDIT:
I've updated the level, the preview image above has been changed to reflect the difference. Also, the map is completed but if it appears to lie that's working as intended.