Thank you for the feedback! The music is an issue we were aware of, just no time to fix :/. About the heaven levels, you shouldn't have to restart from the top unless you touched one of the angels. I assume you were playing the WebGL version, as the downloadable version of the game has transition cutscenes that take up that weird gap you mentioned (videos are a nightmare on webGL sadly). As for the story, I had some ideas that I created the art around, but we weren't really able to flesh it out in such a short project. Maybe one day we will return to the world!
+3 is possible, just takes some careful timing ;)
I'm glad you enjoyed it!