Great game overall. Bullet hells are always cool
The sprite was great and I loved the style and color pallet.
Attack patterns all look very cool as well.
Gameplay was also very intuitive.
Feedback (some of this is pretty nitpicky):
The player's hitbox was a little large. As a result, I found myself sitting in a corner of the map where the bullets were more spread out instead of actively weaving in between projectiles. Maybe make the boss's attacks harder while making the player's hitbox smaller.
Since the main focus of the game was on dodging, the difference between all the weapons I could trade for felt a little unimportant.