I would be in favor of an "Another World" category to mirror the Puzzle Bobble 2 (Arcade) board until we can properly set up a merged board.
As far as the subcategories by Route endings idea, I'm all for new ways to let people compete. But my main concern is board clutter and community interest. Might be something to propose in the Discord. If the interest is there, then I would further propose that a category not be created until someone(s) completes a run. A sticky'd thread specific to requesting new Ending categories could serve as the gathering point to post the video of completed run.