This is quite the unique core mechanic, it's pretty tough to get the hang of and I think some developer difficulty might've prevented you from making it a tad more accessible by having bullets directly fly to the boss instead of having to direct them yourself for example. But that aside, as I kept playing I got more and more comfortable with moving and capturing bullets and it made for a really cool gameplay loop. It helps a lot that the bullets are very slow, I very much appreciate that, the bosses all feel very congruent to the core gameplay system
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Thanks for the feedback!
I definitely considered simply making the bullets just fly directly to the boss when I made the game. I decided not to because I was thinking ahead beyond this jam and say what if I make this a regular metroidvania -- then allowing you to direct the bullets yourself makes more sense. I also considered making one of the boss fights be against multiple bosses, although because coding the health bar would be hell I decided against it.