Oh wow, I didn't know that the original creator sold the rights to it. Hmm. I was considering making a story expansion for it of my own, but since there is a legal grey area---and I don't want to step on any toes. I will refrain from doing so.
Your project sounds really awesome. I can't wait until you have everything done and up. I will definitely check it out when you do.
Both the new people which info is in the other comments and the original creator agreed that its ok to make adventures as long as there is a free to download option. He mentioned in a few comments the only monetization allowed is the support one that also has a free option. I would encourage you to still make your content as it's the only way it will expand. Its a good simple system, just not very well known. The people that bought the rights made a card game out of it that I haven't tried but when I contacted them they had no future plans for it.
