The shooting and movement design comes from Mushihimesama! I think it does a lot of cool things in the bullet hell space, though I also think I am more of an "admire bullet hell from afar" type of person than a veteran :P
I did try a few smaller bullet sprites and found it difficult to track them visually, but this is good feedback! I definitely think I need to adjust some of the big waves near the end and/or their bullet velocity, because I think it's too easy to get trapped. In a good design I don't think using a bomb should be required to pass certain waves. Thanks for playing!