First of all, thank you for the spoiler warnings, secondly, its a really good game. I like the puzzles but I got stuck at one point, not because they were too hard but because I didnt realise you can search song lol, I thought the songs shown were the only ones available.
The backspace issue it annoying but not that much, there being no sound is. Sound wouldve helped greatly, even if it was just some sound track from itch.
Oh also a great implementation of the countdown.