As some people have mentioned below, I can see the inspiration from Touhou! I really like the Touhou games, so I was happy to play this. I think you chose nice patterns for this game jam! I like that the sun/moon remove the same type of bullets. For improvements, I'd say to make a small dot to show where the player hitbox is - it can be tricky to know for sure in a bullet hell game otherwise. I really liked it!