@Phillippe - where/how would you like game feedback submitted? In this thread? Or via personal message?
I'll submit my first input here in case someone needs to blow me out of the water on it...
Game Manual1) Colorful with lots of examples. Seems quite complete and I quite like the look and feel.
2) Index: The index is at the very back, and I would suggest moving it to the front after the cover page. As a reference guide, I find it easier to load the PDF and quickly get to the index to look for what I want. But there's an easy solution to this listed below in #3.
3) PDF Bookmarks: As the manual is a PDF, please consider using PDF bookmarks for the various sections listed in the index. Why? In most (if not all) PDF readers (I personally use and highly recommend PDF-Xchange Editor), a user can open a bookmark navigation panel on the left and have a reading panel on the right. This lets me navigate topics on the left and immediately see the content in the right. Most editing software will allow you to set the bookmarks to map to a document Style when writing documentation, and then the Index via Bookmarks is automatically updated. This allows you to quickly move around sections of the documentation and re-arrange/update/edit as needed without having to update the bookmarks manually.
4) Pg 108 Index Sequence: While on the topic of indexes, the lettering and numbering sequence on the Index starting on page 108 is a bit wonky with multiple duplicates of letters and sections that should be "outdented" as new sections. See page 109 "XI - Playing Cards" as an example. Multiple Letter A sections, and several need to be numeric-numbered sections instead. Of course, suggestion #3 above would help with spotting when this occurs!

I'm reading though the manual now, so wanted to submit this before I forget. Hopefully you can consider the above feedback...