Oooh, sorry I missed it, thanks for pointing it out. Although I agree, a star symbol is not the universally accepted symbol to turn off Post FX lol. Thanks for sharing your project!
Originally we had a mute button also, so it was more clear that there was actually a button there, but turns out there's a unity bug with audio listeners for builds ONLY in the version we used for this game, so last-minute we had to erase all of our mute button code and remove it
I usually try to put options in, too, but I ran out of time on Knallkrebs. Shame that a technical limitation kept you from doing so. It's a minor thing, though and did not influence my rating.