Link's Awakening Remake: Nightmare Mode?

There are already various additions to the remake of Link's Awakening: we're getting more Heart Containers, they've added Fairy Bottles, there are seemingly stands for Mario enemies and of course there is the new Chamber Dungeon mode. But what they still could add is a second playthrough, which changes things up... A "2nd Quest" or "Master Quest", a "Hero Mode" or "Master Mode". For this game, let's call it "Nightmare Mode", because this sounds perfectly fitting.

Nintendo doesn't always do it, e.g. Majora's Mask 3D didn't have one, but most of the Zelda games in the last years had something like it. Ocarina of Time 3D had "Master Quest", of course, Skyward Sword, A Link Between Worlds and Twilight Princess HD all had a simple Hero Mode, while Breath of the Wild got its Master Mode as DLC.

So, there is a chance that Link's Awakening will get something similar as well. The simplest form would be a Hero Mode that can be turned on right from the start, but they could go as far as offering a fully fledged 2nd Quest with re-arranged dungeons. However, there already is something in the game that's supposed to mess with the dungeons in various ways: the Chamber Dungeon mode.

Potentially this could lead to crazy challenges, like dungeons that are entirely made out of boss fights. It will let you experience the original dungeons in very different ways and this could potentially make a 2nd Quest obsolete or maybe even be a reason against it, because it would split the feature in two completely different versions.

On the other hand, if they go through the effort of designing a 2nd Quest, they could build the new dungeons with the Chamber Dungeons in mind, meaning that they probably would focus a lot more on using chamber rooms that can be used in that mode...

But then again the dungeons might end up being too simple, where there aren't really worthy of a real 2nd Quest. It's even a problem that the Color Dungeon had. Because it's entirely made out of these simple square chambers (probably as a nod to the original NES dungeons, where it also borrowed its music), it felt somewhat underwhelming when compared to the other dungeons in the game. It will be of good use for the Chamber Dungeons, however.

Otherwise such a 2nd playthrough mode doesn't necessarily need to change up the dungeons. The "Nightmare Mode" would first and foremost make the fights more difficult by increasing the damage or similar mechanics. They could also increase the number of enemies or swap enemies for more difficult variants, etc.

And even if the main game doesn't have such a mode, they could add one later on as downloadable content. DLC is a good point, actually, where I personally would prefer if this doesn't get any, because I'd like it to stay a complete package like the original game. But the Chamber Dungeon mode could theoretically be expanded by new panels and rooms via (free) updates, where I certainly wouldn't mind the additions.