I think it's a problem with your web browser (or internet connection). Simply put, the game tries to write/read the save data to/from your browser's memory, but it can't.
Everything works fine on my end. I recommend downloading the game and playing it locally to avoid any unpleasant surprises.
Tried it again today to see if it changed and seems it fixed itself not sure what changed tbh might have just helped with a pc restart. Ty for the quick response ^^
