Feels like you may have got a sin/cos call flipped somewhere when I try to whip with the mouse. Also, the sounds are a little imbalanced.
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The idea was to use the click and drag to set the inverse direction of the whip (similar in feel to what the right joystick does in the gamepad). Try holding the left mouse and moving it to see what I mean. I'm thinking of just using the mouse position - player position vector on click instead.
Thanks for playing, pomaodev!