Here's the bottom half of the back of the one sheet. I'm not usually one to hide my ideas but someone was talking reverse engineering the other day and it freaked me out.
Besides, it's not the ideas but the execution that counts...right?
If you're a follower of this blog you'll remember and be able to pick out all the little ideas, influences and characters that eventually became this one sheet.
I've seen ideas similar to this before but Neptoon's added an interesting twist that makes it unique and fun.