The introduction is so beautiful and comfy, I think I said "aww" out loud. Good job on that one to the artist and composer combo. (The drum hit on the lost life was particularly fun.)
The gameplay concept you have going here is awesome. Very floaty and free-style danmaku gameplay that feels natural and lived-in. I know some said the control scheme was a bit strange to get used to, but for whatever reason, I picked up on it right away. Loved it, gave it a very high mark.
Some issues emerge deeper into the game though; I had a hard time knowing if I was hitting Cirno at all, as there's no UI or indication she was taking damage. At some point, I found a soft spot and hit her for 30 straight seconds and... nothin'. But I won't let that detract from what was overall an excellent idea made possible. Would have loved seeing this get some more time in the oven.