Hello!
Cool project. It looks beautiful, calm.
Probably, you won't fix it anymore, but you just noticed a couple more mistakes, maybe it will come in handy in the future:
- if you take a brush and then press the back button with it "in your hand", the brush will disappear, but the drawing sprites will remain;
- when switching the interface mode, the music turns off, but there are sounds.
And why 1574? =)