Possible rp idea?

So I watched this let's play of this rather creepy japanese exploration game called Yume Nikki.

Suddenly I had an idea for a little rp... Let me tell you the basics I came up with.

You play as a human teenager with some sort of problem. That problem may be a fear of the world outside your bed room, you are in a hospital, something along those lines where you are trapped in a room and something is wrong with you. Anyway.... you spend most of your time dreaming. As soon as you start dreaming (you may wake up from time to time and do something. Events while awake usually have small effects or no effect to the storyline.) you come to this place called The Nexas. It is a void with nothing but doors that lead to different worlds that reside within your (messed up) head. While you explore these worlds, you may run into other dreamers (characters), events, and you may find dream powers (Powers mostly created by you that help you explore the dream world and have fun). Soon enough you find out that the dream world has a major problem. It is under attack by a humungous demon named Noir'para that is threatening the peace of the dream world, corrupting it so no one and nothing can escape or survive in it once it gets in. The dreamers must find 10 dream crystals within the worlds and bring them to The Nexas to seal away the demon with their dream energy, before Noir'para can corrupt them with his dream energy. Once they succeed.... well.... this is the part where I must do this

Spoiler:

Thoughts/opinions?

Spoiler:

I have a few questions, particularly about the location/origin of the dream crystals and Noir'para, but I can pass those off until you're refined the idea. Looks great, and I certainly think I'd join it.

I think we should figure out the worlds first.... Ten should do.