A fun excuse for danmaku! The movement being controlled by mouse is not very fun for me though. It'd be nice to at least have the options for more conventional controls because once the patterns start demanding more micrododging, it gets a bit too frustrating to want to complete. Maybe it's just a skill issue though.
Good art, writing, and concept though. And the patterns themselves are definitely well thought-out, it's just the controls that hold it back from being as fun as I know it could be.