I had an idea about, you have to use rewind to pass the levels, but I couldn't manage to achieve all the things I wanted. For example, I was thinking of very very hard levels, but you can rewind many times in a level to memorise a pattern and pass it. But I couldn't figure out how to code it without any bugs. So I made an easier version which I agree with you, its not that related.
Thanks for the comment, and I am very happy that you liked the story and music.