When I opened the unedited version of ec_Screen1, I noticed that in addition to the tiles matching the Planetes 01 tileset, it also had an unusually large amount of other tiles that matched no known Nurykabe tileset. So I deleted them.
But I just realized that they actually seem to match a weird and very unfinished tileset that's in the same directory as ec_Screen2 (which as a reminder is completely identical to ec_Screen2). So maybe they were meant to go together. All they really depict is some sort of sail. So here's a version of this screen with the sail:
https://www.mediafire.com/file/djr2br4222azrgh/ec1_Screen1.7z/fileI've attached a screenshot of how it looks. The vanilla editor doesn't like that this tileset has fully transparent tiles, but it still works.