How about this for a mod idea...
It would be about Misery and Jenka, and would take place at specific points of time before the events of cave story. It could show the invasion (by the soldiers of the surface) of the island, how the demon crown was created, and even how the island came to be.
Presumably not in that order.
The timeline is:
Lost in the mists of time:
- Ballos goes nuts
- Jenka seals Ballos
- Misery gets Ballos to make the Demon Crown
- Misery is cursed
- Halda's and Annachponae's reigns (these are given little fleshing-out, so that makes good fuel for creativity)
10 years ago:
- Robots invade, Mimigas use Red Flowers
- Robots secure Demon Crown for Miakid
- Miakid unleashes Frenzied Mimigas on the surface
- Quote and Curly Brace fight Miakid, end up in comas.
- Miakid is defeated by unknown means (also a good spot for creativity)
A short while ago:
- Human expedition team arrives
- Fuyuhiko Date takes the Demon Crown from Miakid's skull, laughing
- and the rest is history...
One thing that's not explained, and could really have happened at any time after Misery was cursed, is how Balrog ended up cursed.
It'd be narrated by a logbook written by Misery.
Instead of finding weapons, Misery learns spells from Jenka and the Cthulhu. Maybe even from Ballos...
This of course would have to be started after jenka's nightmare is finished.