Thank you so much for the comment. I think your the only person to talk about the music so far. Initially I was just going to use some royalty free music, but I felt that the music would be too high quality for the simple art, so I just went into some music creation software and made something simple in like 10 minutes. I do wish I made the track a bit longer so its not as repetitive. The reason for level 4's ramp of difficulty was that I wanted to add a lot of levels and slowly ramp up the difficulty, but then when making level 3 I realized that I was running out of time so I just made level 4 a bit more difficult.