Yeah, we're not sure what that is, it only happens in the browser version for some reason. It seems like when all the music and sfx/clips come together sometimes it clips the master fader and causes little pops. Sorry about that! Hopefully it didn't ruin the game.
I got that popping in one of my jam games too. I found it can be due to too many audio sources in the scene, notice how it gets progressively worse the more sushi is spawned? I'm just guessing here from my observation, but it appears you have an audio source spawning with each plate. For that sound effect, you could get away with a single source. I really enjoyed this btw, great work!