Hey guys, so Alpha 4 is finally out of the beta and onto the default branch! There shouldn't be any more bugs related to this new version, but you never know.
You can read more about what this version has to offer in this announcement:
As said before, Alpha 3 save files aren't compatible with the newer version, so if you want to continue playing on your old files, you can switch to the old version by going to the 'Betas' tab of the game on Steam and choosing your preferred version there.
Work on Alpha 5 will begin sometime this week.