I'll preface this by saying that I don't play a lot of rhythm or musical games so my impression could be a naive or under-informed one, but... This is one of those games where, now that I've seen it, I can't believe I've never seen it before. This game probably has my favorite central game idea that I've seen in this jam. A tower defense game and a DAW/MIDI-editor actually share so many fundamental mechanics and you've tapped into their commonalities brilliantly. There's so much to be mined from this concept. I'd really encourage you to continue working on it after the jam and seeing where the game wants you to take it. There's something really novel and promising here, I think.