I've managed to fix the issues my new laptop was having with GB Studio (it was Windows Defender) and so I've been working on updating the menu a bit to add these 3 difficulties.

They won't actually differ much story wise, but they do offer some semblance of a challenge

The first one is Normal. The number of the day you're on is the number of hearts you have, and each heart can take 4 hp of damage (like TLoZ games)

So basically:

Day 1 - 1 Heart, 4 hp

Day 2 - 2 Hearts, 8 hp

Day 3 - 3 Hearts, 12 hp

Day 4 - 4 Hearts, 16 hp

Day 5 - 5 Hearts, 20 hp

And at the start of every battle you fully heal any health lost

You also get to start battles again if you died and the game saves at the end of every day.

(unless you're using the "no save" file)

The second difficulty is Hard. You earn half a heart per day instead of a full one.

So:

Day 1 - 0.5 Heart, 2 hp

Day 2 - 1 Hearts, 4 hp

Day 3 - 1.5 Hearts, 6 hp

Day 4 - 2 Hearts, 8 hp

Day 5 - 2.5 Hearts, 10 hp

Like in Normal mode you can fully heal, but instead of it being after every battle it's at the start of the next day.

You also get to start battles again like normal mode, however since hard and N̵͍̔i̸͔̎g̴̻͋h̷̼͝t̵̪̔m̶̟̋a̷̘̾ŗ̶̑e̶̮̅ are exclusive to the "no save" file, you cannot save your progress.

And finally there's N̵͍̔i̸͔̎g̴̻͋h̷̼͝t̵̪̔m̶̟̋a̷̘̾ŗ̶̑e̶̮̅ mode. This will be the hardest mode in the game and as it's title suggests, very likely to be a nightmare to complete.

Day 1 - 1 Hearts, 4 hp

Day 2 -> Day 5 - 1 Hearts, ? hp

And in nightmare mode, your singular heart will never regenerate health when starting a new day.

Basically, you have 4hp to beat the whole game. And if you die, you're booted back to the title screen instead of getting to retry whatever fight you died to, and like stated before no saving to try get around the title screen reboot, either.