I figured out what was wrong with the save system like 20 minutes too late :c
The current version of the game has save system working perfectly fine, but we no longer can upload it, oh well
Viewing post in Farmer's Nightmare jam comments
I mean they said that bugfixes and patches are fine, especially if its *game breaking*, no saving system is fine, but tbh you could try to patch this if you think it wouldnt break their terms
I already did a 1.0.1 patch that changed a unreadable font and also I made a WebGL port so that people that have to download if they dont wanna do that