Mimiga% Beat the game with the Mimiga Mask equipped. Meme? Yes. Fun? Also Yes. Add? Good question.

I'd suggest calling it "Mimiga Mask Ending" or something along those lines, so that the naming scheme is consistent with "Best Ending", "Normal Ending", and "Bad Ending".

I'm personally not sure how I feel about having two categories that are exactly identical except for the last ~5 minutes (and basically the same after that anyways except for Last Cave being different), but I suppose there's no real harm in it so I guess it's fine as a miscellaneous category.