Idea I've been kicking around.
Let's say you have this character- a girl. Let's call her "Dahlia Grayhill." Dahlia is possessed by a demon of wrath and has access to very gruesome attacks/weapons. However, if she kills ANYTHING, the demon will fully consume her soul and take over her. The main goal of the game would be to find some way to exorcise the demon from her, but she's targeted by various groups of people that want her dead.
In the game, killing the enemy is presented as the easiest option. But if you do that, it's GAME OVER. So the real challenge is finding a way to avoid a battle/non-lethally dispose of an enemy, rather than strait-up murdering them. Also, perhaps finding the balance between whittling away an enemy's health and not killing them would be a factor. And, of course, the think piece-factor of the whole story.
Also, what would the title be? I'm thinking "Don't Kill" or "Have Mercy," but I'm open to other ideas.
Either way, this may or may not be my IGMC project this year. (Thinking up ideas for a game isn't against the rules, right?)