The bear boss cannot be killed. its mechanics are too complicated for beginners, I downloaded the game and deleted it right at the moment with the boss.
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You probably did what I did. I ran through the game for the adult content and then at the boss had to actually figure out how to play. The boss is easily beatable. He has one attack. You have a dodge button. Figure it out, homie.
Guess you shouldnt have deleted it right at the moment of the boss, you should have tried a few times.