Over the holidays I have been thinking a lot about this game, and how I will be able to get the most out of what I have to work with (Eg, me). I have the storyline, I have the characters, I have the mechanics, but I don't have the gameplay, which some would argue is the most vital part.
So I decided to step back from it all, and separate everything, and all of a sudden it just worked.
The game I will be making is a super simple, side scrolling game, featuring an unnamed character and his sword. The power inside of the sword makes it desirable - As in, it's power is to lure people towards it, who then try to take it for themselves. The objective of the game is to get to the end of the level, simply by moving right. The player will have to fight their way through hordes of constantly spawning enemies, all of which are coming from the same location as the sword - Out of Ragboy's dimensional portals. Each opponent will take one hit to kill, and the player will also die in one hit. However, if the player does die, another person will simply pick up the sword and the player will then assume control of them, killing their former allies and continuing with their objective.
I want to go with super simple visuals, possibly even just two colour (white/shades of purple). In my head, it works without being too pretentious. In reality, who knows.