If I have time, I do hope to do a global "play these levels again that you've already played" sort of central list, with completion statuses on each one. But it just depends on if I wind up with time or not.
Regarding the overworld map, that's something older versions of the game used to have -- actually, there were two levels of map in the game, one for levels/regions, and one for cross-regions. We removed those when we ported the game to unity, because it messes with the atmosphere. And if you've got a central list of levels, or a way of doing fast-travel or similar (both of which we'd been contemplating), then the maps are less needed because it's more about going to places you've not yet been rather than places you've already discovered and are trying to remember what was what.
In other words, with a map it was only so helpful to see the overall layout, because if you didn't remember which level was in which screen, that was basically no help. And since some of the levels are hidden, showing that as metadata on the map is more than a bit tricky. Doing a central list of levels approach really would be cleaner for the player and for us implementing it, I think.
