Cute game, I love Cora's design! It's so refreshing to find a shmup with a nice and fast base movement speed. It gives me the option to macrododge whenever I want and that always feels nice. Some of the later patterns however I feel could have benefitted from the player having a "focus mode" where they hold some button to view their hurtbox and kind of slowdown their movement speed to make micrododging between all of those bullets a much more viable and less risky option.
I want to share with you a resource I always come back to when designing SHMUPs, I've always found it to be incredibly helpful in covering all of the major design problems and terminology you'd face when tackling the genre: https://www.youtube.com/watch?v=yAF2FkgyiYM&list=PLj_fo4j9ZtOlW8jUPFG-zlONynlI0ycnu&index=1
I hope you find some utility in that!
Overall, I loved the visuals, the game over screen, and the music. Very charming! I had fun with this one :]