I love the artstyle and the UI design. There are also a lot of mode to juggle and play with. Boss was really cool too.
Some critique coming from a bullet hell shmup perspective: Some of the enemy projectiles and enemies themselves are too small to recognize quickly and same goes for player projectiles too that caused it to feel really weak. Another is very subjective and depends on the game design but usually the hitboxes of the player and enemy bullets in shmups are actually way smaller than the sprite itself, allowing for more bullets and more complex patterns to fill the screen without being too unfair (you can search up Touhou hitboxes to see more about it).