But I thought surely people would be inclined to give feedback on rather or not they liked the idea.
Well you posted a really long pdf about your idea.
It's a great work, and it's really great that you have such a detailed idea.
However you can't expect, that someone, who don't wanna actually work on it will read it. It's really good when you share your concept with someone who work with you on that, but it's much more than an idea.
There is too much detail to catch the point as someone, who just read alot of topic searching for something interesting. Only the peoples who are already interested will read that pdf, but you didn't inspired anyone to do that.
I think you would have better success by writing an overview about your idea, what do you think, what's the most unique, most interesting thing in your project? What is the thing that will inspire someone to work on it, or play with it?
The details are really important if you want to make a good game, however, to sell your idea you should focus on the point of your project.
Also i don't know what's the point of that topic? Do you want opinions about your idea? Do you want someone to work with? (in that case, what do you need? C++ programmer? Artist? Musician?)
If you would clarify these things probably you would have better success, i guess the best you can do it is clarifying these things in another topic.
I hope i could help, good luck!