"The mouse dances a bit too much in my hand".
I can appreciate the game a bit but it didn't go smoothly for me.
Even after managing to clear the Jam version, and attempting the postjam one, the movement controls still feel uncomfortable to me. I have to lift up my mouse quite frequently to recenter it.
Probably worsened by the fact that the play area is a single unified color. It really makes it hard to gauge where in the play area the player is, AND how fast they're moving. (Maybe the camera being solely focused on the player doesn't help to this end neither)
This one thing will greatly affect the perceived difficulty of the game, methinks.
Anyway, some of these patterns are really hardcore (especially considering the movement controls). For example, there's the 2nd phase where Cirno flies a square shape. You can barely land a few hits if you don't figure out where to place yourself. I've seen a fair share of placement-puzzle-like danmaku patterns (looking at you Subterranean Animism), and I do think this 2nd phase is slightly overboard.
The last phase is of course the one that takes the cake. After 4 gameovers in the last phases I decided to just tank the last phase's closing ice walls and stay at the border of the play area. Yeah, I'm not trying to stay and dodge the last phase up close, I find it barely possible if it is.
At least the BGM is a pleasure to listen to, and the vibe of the story's good.