So the game should work as a short story. A re-imagining of the "Ghost" story - by which I mean the Whoopi, Demi and Swayze affair. The All Hallows' Eve thing is just my cup of tea. I paint in bold colours; be it writing, music or be it craft and design and nothing is more bold and colourful than halloween.
My idea of hell is that it is full of white people, mostly men and a lot of priests. There might be a small amount of gay people because of a ridiculous "written legislation" but they are treated better than anyone else. As it is in Dante, Virgil will show you the sights. I think he will speak in rhyme as an allusion to "Inferno". Other references will include the forest of suicides.
I feel the real idea of the game is to explore and be entertained by what you see and that the experience should not be long lived but should have a substantial end. This way everything the player should do adds to their story. "How was Hell?", "Full of white men", "Full of nude babes", "Full of easily impressed demons" "all of the above plus some awful music".