Probably save file corruption. I think you can clear cookie to reset it.
If you open inspect menu (f12) > application tab, on the right you will see storage > local storage you will be able to see save file name "SimplerSpace.0.playerdata.json" right click + copy that file and send it to me (or put it in pastebin) so I can check the error. Thank you.
Currently I play this on my chromebook however I'm probably going to switch to my monster PC as my chrombook cries when I open the tab and boot the game up (CPU at 68 C rn) and I was unsure how to copy the save file; If it happens on my pc I'll do that for you. Thanks for the tip!
ALSO;
I don't know if I said this before but your game is AMAZING, and I encourage you to continue. Again, thank you for giving me the help you have and for creating this beauty of a game :)
