Thanks for the detailed feedback. A few other comments mentioned finding parts confusing but didn't go into specifics, so I was wondering (though I had some suspicion)! I totally agree about the instructions/hints. In fact, I did hastily add a hint option like 10 minutes before submitting but didn't really indicate anywhere that it existed (except mentioning a settings menu in the description), and even then they're not very good, so I'm not surprised it didn't help!
Thanks so much for the kind words, they genuinely mean a lot!