I'd also like you to add new genre's in your list here
Board games, Card games, Casino games. PysolFc is a great card game.
Visual Novels - Katawa Shoujo, True Remembrance, Narcissu, Brass Restoration
Board games would be a sub-genre in what section? Chances are it would be turn based but what would make a PC game a board game? Perhaps, based off of a KNOWN board game?
Card games, Casino Games would be under Strategy - Turn Based Strategy games. I don't have any so for but I will take a look at your recommendation.
Visual Novels will be under Adventure games soon enough. I take a look at the 3 your mentioned that I have not tried.