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This boss has three attacks, each being mean in their own special way. As the fight progresses, the screen gets more and more restricted, making you navigate the smallest of gaps in an attempt to finish off the boss, before it finishes you off.
You automatically fire from your mouse pointer. The tip of your mouse is your hitbox.
Do you seriously think this is bullet hell?
really have you seen bullet hell in enter the gugeon if not chek it out
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This is pretty cool, I'd suggest adding a game over screen though if possible.