I've been sitting here, happily adding to the game's first area and first dungeon, Scrap Brain Zone, including Sonic 1 monitors in the place of chests, those little nodes that send out electricity and naturally, new areas, when I realised I might wind up putting in too much of the Scrap Brain Zone!
How long, roughly, do you feel Scrap Brain should be, considering it's the first area of the game? You can answer with "x amount of Maps", "x hours/ minutes of gameplay", whichever format you feel most comfortable with.