Quite a number of enhancements...  And let's be fair, every fan-made project has to have a secret dungeon, right, to add a personal flair?  Well, because Meme Mode is my particular baby, the secret dungeon is ONLY accessible if Meme Mode is active.  And, there is no obvious hint to enter, and I'm not telling.  

BUT - I will give one hint: if you know the game well enough, and aren't afraid of glitches, you'll find it.  And good luck - it's not overly difficult, but it's more difficult than anything the game has thrown at you.  This dungeon is fair at times and cheap at others.  But, it can be defeated.

• The Dark King is now very weak to HP restoration, similar to the original.  It's not EXACTLY like the original, since I can't overflow the damage easily, but it works.  It does a flat 32,000 damage.
• The secret dungeon is completed - Meme Mode required to enter.
• Added secret Red Magic spell.  It's more than twice as powerful as Flare, and to give you an idea, it will actually be useful in the secret dungeon.
• Secret bosses are completed.  One is already present in the game from launch, and no one has found it yet.  There is some hint dialog in the game, and in the new secret dungeon, this boss is referenced once in one place.  This provides another hint.  If someone finds this secret boss, and isn't sure about how to defeat them, message me.  I'll spoil that one for you.
• Secret video added for when the secret boss is completed.
• The ending is updated if secret dungeon is completed.
• The ending is updated further if all secret bosses are dead.

Good luck...