Oh! maybe it was a glitch?!? I've just tried playing it again, and this time I got the "Too many Scribbles..." notifications on the top of the screen - those didn't show when I first played it - So yeah, things make more sense now.
Ah thanks! Now that I got some hard play testing in theres some edge cases popping up like yours or a crash at the end of the game. Hard to catch but good to know when it happens.