(I didn't change it because apparently I forgot to put it on my to-do list, since I made sure to fix everything on it. It's there now though)
And yeah, not sure what I would do with the redundant levels. There's a bunch of unused ones that didn't make the cut (like the invisible blocks beach level) so going for a reimagning with all-new levels would probably be the best option, or touching them up with the new mechanics I added through the development of DDG2 (slopes aren't used a lot, for instance, pretty much only in Monument Valley and Snow Queen's Castle).