Haha, I loved the first two times the boss surprised me :)

After that it get's hella tedious. Also, it's a little bit small. I only saw circular bullet hell, jumping on me and splitting; are there more later on?

There are boss-phases when the boss hp gets lower.

Wow that was hard. I would really have liked to have some health that would have allowed me one or two hits. The background also made shots hard to see and when the ball jumped and just landed on me, I would have liked the pause before it came crashing down to be a bit longer. Nice entry though.