I'm almost finished the first few pages. I've got a bit over 1000 words written so far. I pretty much know where I want to go from here too, so I'm thinking I can pump out 1000 more tomorrow.
So basically, you play as the currently unnamed protagonist, who finds himself in Hell. He's told by one of Satan's messenger boys that he's kind of a dick and therefore has been sentenced to eternity in the underworld. In a surprise twist, however, he's told that Satan issues an open challenge to every new resident of Hell. All our protagonist has to do is traverse the depths of Hell, reach Satan's castle, and defeat the Demon King in a duel. If he is successful, he is granted entry into the Heavens.
I'm planning a few bad endings, one good ending, and one "true" ending,so it should be fun. Hopefully.
Also, any name suggestions for our protagonist? Can't guarantee I'll use it, but your ideas can't be any worse than mine (I was going to call him James).