Some images are not uploaded because they are smaller than the minimal size allowed. A lot of images look similar but they have slightly different blur effects. (That explains why the game takes so much space) The images are extracted from the NS version. I guess the PS4 version may contain images of higher quality, but I don't have access to it for now. The category should be "Non-H" rather than "Game CG", according to https://ehwiki.org/wiki/Gallery_Categories#Flow_Chart . This is also how Mahoutsukai no Yoru is classified.