Hi there, sorry for the late response, but better late than none at all, right? ;)
Yes it seems your player save got corrupted. I wasn't able to get it to work either, with all other files intact. Even upgrading it to the beta branch did not help. I would however suggest you play on the beta branch, Koonschi promised to be more careful with his updates after the thruster outbreak and most of the save file corruptions have been fixed on the beta branch. They still can happen, but at a much lower rate.