Hello. I'm sorry to hear you're getting this issue. This is most likely due to you having played many different games on itch.io and your localStorage in your browser has filled up. There may be some data from other games filling up your localStorage. My game should only require around 3-5KB total and most browsers should allow up to 5MB in total (around x1000 what mine requires).
If you go to DevTools > Application > Local storage > https://html-clasic.itch-zone you might be able to see which items are taking up a lot of space and clear them up. For Fracture Field it's called saveData_Production so don't delete that. You can see how big one of the items is by clicking on it and then selecting the entire value to see how many characters it is.
