Hello, I'm deely sorry about that issue. indeed, New game + is supposed to keep your gallery.
But your previous save should still be intact.
you can find the save folder at this location: %appdata%/../LocalLow/GrizzlyGamerStudio/Robin Morningwood Adventure
and you'll find a -bak copy of a savefile.
For exemple, if your save was in the first save slot. and you want to restore it.
in the save folder, check the existence of Save0-bak.rma if it's there, continue the steps below
Delete Save0.rma
Rename Save0-bak.rma to Save0.rma
Start the game and load your save. Save once and everything should be back to normal.
If that's ok with you, Can you zip the content of that folder and send it to us at grizzlygamerstudio@gmail.com
This way I will check what went wrong and issue a fix for it.