So, I couldn't get past the first level... lol. For some reason when I press x it doesn't always record a position, and when I press z it doesn't always rewind. I tried all I could think of but I don't understand how I can get past the walled off first part of the first level - rewinding doesn't change the wall at all, and doesn't add a platform to the right.
But I also just want to say that the tape is so cute, and it looks amazing. The default music is really really good, and the idea to let players put in their music is genius!