if you get past the fence in the maze area, it also takes you back to the hub, so it's most likely intended as a way to go from hub -> lonely door and vice versa in the full game

besides that, there isn't any actual gaps in the geometry, it's just some weird clipping that forces ENA in to the ground somehow, idk if anybody truly knows exactly how it works. but even decompiling the level shows that there's no gaps in the floor or the wall, someone proved that before