Love to hear it! In theory it should just load from the same folder. If not you can just copy paste the save files over. If you open the parallax viewer on the almanac then tell it to save it will load the save folder for that version without having to go digging for it.
Viewing post in Sternly Worded Adventures comments
Okay, for some reason, I was running the Steam version through Proton (I'm on Linux) which is why the save file didn't automatically transfer. But otherwise I think the Steam and Itch version save to the same folder.
Hunting down the save files from Proton is always a bit of a hassle (for me they were in ~/.steam/steam/steamapps/compatdata/2570560/pfx/drive_c/users/steamuser/AppData/Roaming/SternlyWordedAdventures) but copying them over to ~/.local/share/SternlyWordedAdventures worked just fine - and should theoretically work backwards as well, if I want to play the full version on Steam when it comes out.
For whatever reason it likes to run Proton instead of the Linux native version by default, which is definitely a choice, and based on the fact that that compatdata path includes the Steam AppID it'd load a different folder for the full game when running on Proton. (Demo is 2570560, and full version is 2562130)
Linux native version in and out of Steam and/or the demo should hit the same ~/.local/share/SternlyWordedAdventures folder regardless.