Hi storycircle,
Thanks so much for giving my games a shot! I do believe I had something interesting to explore in ExG but I need to rework a lot of aspects to make it easier to understand.
As far as games being connected, they are The Old Ones, Jonas and Eve, were first introduced in Arcane Dice Wars and they appear in Gacha Date, Allele and ExG.
If you are looking for finished games, all the arcane dice wars games are fully done with multiple endings.