Definitely best from scratch!
To not go into too much details, in beta we realized due to certain elements (things I still don't have a clear answer why) broke, and half the saves weren't even openable, and half was, but it wouldn't open where it was exactly saved.
After that I changed a lot of names and variables inside the game so they are both more intuitive for me, but also in a way that they shouldn't break in the future (from defining them with "$" to defining them with "default").
So yes, even if you manage to load, you definitely should start from scratch ^