Absolutely agree on the mute button. Workaround is to mute the tab or the app, but I plan to add an actual mute button once the jam is over. Honestly, I just didn't really know how. This was my first time doing sound in Godot. Also kinda surprised someone did all the levels, did you find the secret world?
Viewing post in Chesscourt Mission jam comments
Actually no, those are just little easter eggs. Level 21 (the end screen) is secretly a playable level, and can be beaten. Look closely at the edges of the screen. (You can also use the press M, I & Z on the title screen to cheat any unlock all levels, including the secret world)
It's super difficult, so I didn't want to make it feel like a necessary part of the game. But if you're interested... there is more!