I honestly got to the boss without really understanding what I was doing. The whole graze the core thing is neat but easy to exploit. Most of the time I just moved into the swarm of bullets until the bomb went off. That lack of challenge made the game too easy. But unique :)
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Thanks for playing and your comment.
I should definitely work on making the goal of the game clearer, as well as on effects to make actually grazing bullets more evident.
The idea is to go for a high score (which is why I am going to implement leaderboards), and running into bullets prevents that: hopefully I can make the game say that for me.