itch.io

Are you downloading a version 0.18 save to use on 0.18.1 because more than likely it won't work. Different version saves usually don't work with different version games. Summertime Saga (not trying to promote) has a cool feature where older version game saves are grayed out on loading screens

Just rollback until it works, that happens when you've saved in an awkward spot and try to load it in a new update