How do I defeat the first boss in this game when I tried to I don't know he just kept  killing me instantaneously

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What weapons do you have? I would recommend trying to jump and hit, but lack of stamina is important

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The weapons I got are a hammer and a ball launcher

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If you have enough attack, use the Pachinko. After he uses his hammer, go up to him and hit him 2 or 3 times with your hammer. He's stunned after he uses his, and if he has low hp, he'll be stunned for more time, giving you more time to hit him. I think the required attack to hit him with the Pachinko is 4 or 5. If you don't hear a pain sound when you're attacking an enemy, that means you didn't do any damage.

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