While I recognize the inherent issues with making this, this is one of the mods I really, really, really want to see, outside of Noxid's mod being completed and someone picking up/restarting Misery Story.
The sad part is that I have the entire working script (cutscenes, item descriptions, object interaction) for a Balrog Story written out. I played the game in both translations several times to get the best feel for everyone's (but mostly his) sentence structures/train of thought/character composition. I started to write it out during the long breaks between some of my classes and it kind of escalated.
It actually would start from the point at which he was teleported into the labyrinth by Misery and run parallel to the actual Cave Story game, from that point to the end. So the cutscene where he lifts the boulder and the endgame cutscene would both be exactly as they are in Cave Story. So, in essence, it's half of Cave Story, but from Balrog's perspective. The running time would be about half of Cave Story's time as well.
But it was just for fun, I guess. I can write and sprite, but I cannot program or level design for the life of me.
Some additional, way-too-ambitious ideas I had while doing the script (feel free to ignore this, this is all pure wank):
- Altering his physics so that his jumps are not that high, making him feel like a heavy character. Initially he'd only be able to jump 1-2 "blocks" high (I don't know what actual units this uses).
- Later on, you'd be able to make jumps like the kind you see him do in-game. They would be like superjumps and be capable of breaking through some types of wall.
- Making it semi-mario-style where he could injure enemies by landing on top of them, since that actually seems to be his primary method of fighting things.
- Basing his "weapons" on the ones you see him use in-game. But that would result in a really small arsenal, so I don't know if it would be more prudent to be inventive and add a few we haven't seen for variety's sake.
But yeah. I don't actually see it happening because of what Noxid said.