Hi and thank you for the kind words! So far old saves have worked after every update and I hope that's the case also in the future. I've had only a one report of a broken save during this first year. The good thing is that the mechanics are already implemented, so the future updates are mostly content updates and there shouldn't be any dramatic changes to the mechanics and stuff. I guess it's quite safe to say that the save games will keep working in the future too. :)