Thank you very much!!!
The self-teaching element was really important for me and I'm really glad that you noticed and liked it. I still need to make some more improvements as some people were confused by the melters, but I think that it's heading in the right direction.
For the ball movement, others suggested making it so the player can control the ball from anywhere on the screen and I think that it will make the steering much easier and allow for more interesting levels (as I needed to compromise on how hard some levels were as the ball wasn't the easiest to control)
I think the reason why the music restart felt weird is because of otherwise seamless transition between tracks on different levels. I made 9 different tracks with the same chord progressions and made them continue where the previous one left off when switching the level (so it's like the same music playing but a new instrument added on each level). Unfortunately I run out of time to make the music during restarts as seamless as it otherwise is, so it might have been especially noticeable. Still, thank you for reporting that!
I think this might have been the most positive feedback I received during this jam, thank you very much!!!