Stupid hard, but really fun! I love the idea behind it, and getting to the end felt super rewarding - I felt like I'd gotten a handle on the timing. The way the bells ring when you hit them, and in tune when you hit them in combo really made me motivated to do the best I could.
My main concern with it is the hit detection - I got the hang of it after a while, but the timing for hitting the sword with the bells still felt a bit awkward - especially at the end, where I was hitting my head on the top of roofs a lot. I think maybe adding some more visual feedback to when you hit the bells would help a bit there.