This is a beautifully simple and indepth document.
Sadly the format is holding it a bit back. Photoshop isn't what comes to mind first when you think of editing documents. The complete GDD project you released is in word too. So, why did you switch formats?
Still incredibly handy :) can't wait to try it on some of my concepts.
Edit: I hope i don't overstep it here, but i whiped up a basic doc file out of your design. https://www.dropbox.com/s/e6w5qeup5xjfi9w/GDD1P%20DocVersion.docx?dl=0 hope thats okay, if not just say and it'll be gone in no time. If you want to include, edit, change or do whatever to it, please do so - it's still your work and design in my opinion :)