This was fun! I kinda got bored and decided to poke at the save file to see what does what lol. I may have missed something, but I saw that there is currently no way to save with “Off” set for effects level, you’ll probably want to re-factor that to an int instead of a boolean value as off/low are both set to 0 with “low” being what gets read in. Also, options > laser effects doesn’t seem to write out either.
There’s also a weird glitch I encountered where importing the save would take a second and then break the ability to import/export (or sometimes even leave menus) - you have to refresh the page to get the functionality back.
Note: This is in the web version, browser: Floorp, OS: Arch (btw lol)
[EDIT] I didn’t realize how old this game was, my b.